LEWIS R. MORGAN, Senior Circuit Judge:
Ralph H. Currie and Carpets by Ralph H. Currie, Inc., (Appellants) appeal from an order of the United States District Court for the Northern District of Georgia denying the release of Internal Revenue Service documents pursuant to the Freedom of Information Act, 5 U.S.C. § 552 (1978). The Internal Revenue Service contends the documents are exempt from disclosure under the Freedom of Information Act, 5 U.S.C. §§ 552b(3), and (b)(7)(A) (1978), and the Internal Revenue Code, 26 U.S.C. § 6103(e)(7). The appellants contend the Internal Revenue Service did not provide a sufficient factual basis and justification for their claimed exemptions from disclosure. We conclude the Internal Revenue Service has sufficiently demonstrated the withheld documents are exempt from disclosure under the Freedom of Information Act and therefore affirm the court below.
I. BACKGROUND
The Internal Revenue Service is conducting a civil and criminal investigation into the tax liabilities of Ralph H. Currie for the tax years 1975 through 1978 and a civil investigation into the tax liabilities of Carpets by Ralph Currie, Inc., for the tax years 1976 through 1978. The appellants filed a Freedom of Information Act (FOIA), 5 U.S.C. § 552 (1978), request with the Internal Revenue Service (IRS) seeking the release of certain documents1 within the control of the IRS relating to the IRS’s investigation of their tax liabilities. The IRS released part of the documents covered by the FOIA request but refused to disclose the remainder of the documents,2 contending the undisclosed documents were exempt from disclosure pursuant to Exemption 3, 5 U.S.C. § 552(b)(3), and Exemption 7(A), 5 U.S.C. § 552(b)(7)(A),3 of the FOIA and [526]*526pursuant to Sections 6103(c) and (e)(6)4 of the Internal Revenue Code of 1954, 26 U.S.C. §§ 6103(c) and (e)(6). After the IRS failed to timely process and respond to an administrative appeal, the appellants filed this action in the district court seeking production of the withheld documents.5
The district court found the withheld material was not subject to disclosure pursuant to 26 U.S.C. § 6103 and alternatively, that the withheld material was exempt from disclosure under the Freedom of Information Act’s Exemption 3, 5 U.S.C. § 552(b)(3), and Exemption 7(A), 5 U.S.C. § 552(b)(7)(A).6 The district court also denied the appellants’ request for an order requiring the IRS to submit an index detailing each withheld document and justifying the exemption from disclosure pertaining to each document. From the grant of summary judgment in favor of the IRS, the appellants bring this appeal pursuant to 28 U.S.C. § 1291 (1978).
II. DISCUSSION
The IRS contends that I.R.C. § 6103, 26 U.S.C. § 6103, is a self-contained statutory scheme regulating the disclosure of tax return information and therefore the disclosure or nondisclosure of such information is not subject to the FOIA and its concomitant procedural requirements and policy objectives. Judicial review of the agency’s [527]*527decision to withhold these documents, they argue, is limited to a determination of whether the decision was arbitrary or an abuse of discretion. We disagree»
Exemption 3 of the FOIA, 5 U.S.C. § 552(b)(3), provides that the FOIA’s disclosure requirements do not apply to matters specifically exempted from disclosure by another statute, provided the statute meets particular criteria.7 In Chamberlain v. Kurtz, 589 F.2d 827 (5th Cir.1979), cert. denied 444 U.S. 842, 100 S.Ct. 82, 62 L.Ed.2d 54 (1980), this court’s predecessor8 determined that 26 U.S.C. § 6103 satisfied the criteria of Exemption 3 after extensively analyzing the language of Section 6103 and the legislative history of Exemption 3 and Section 6103. Accordingly, the court held that tax return information, as defined in 26 U.S.C. § 6103(b)(2),9 is not subject to disclosure pursuant to 26 U.S.C. § 6103(e)(6) (now codified as 26 U.S.C. § 6103(e)(7),10 where the IRS can demonstrate the release of the information would seriously impair federal tax administration. Id. at 838-40. Importantly, the court viewed the nondisclosure of the requested information as an exemption from the normal policy of full disclosure under the FOIA.
The IRS’s contention that Section 6103 is a self-contained scheme governing disclosure derives from a line of cases having their genesis in Zale Corporation v. IRS, 481 F.Supp. 486 (D.D.C.1979). Judge Gesell, in a well-reasoned opinion, determined that Section 6103 is the sole standard governing the release of tax return information. Id. at 490. Therefore the court limited judicial review of the IRS’s determination on disclosure not to the FOIA required de novo review, but rather to a determination consistent with the Administrative Procedure Act, 5 U.S.C. §§ 701 et seq., of whether the decision was rational and supported by the record. Id. at 490.11 Any other construction, it was concluded, would render Section 6103 a “legislative futility.” Judge Gesell reasoned:
[T]he structure of section 6103 is replete with elaborate detail identifying the discrete groups to whom disclosure of certain specified types of information is permissible. In this respect it differs markedly from the structure of FOIA, which calls for the release of information to the public at large with no showing of need required.
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LEWIS R. MORGAN, Senior Circuit Judge:
Ralph H. Currie and Carpets by Ralph H. Currie, Inc., (Appellants) appeal from an order of the United States District Court for the Northern District of Georgia denying the release of Internal Revenue Service documents pursuant to the Freedom of Information Act, 5 U.S.C. § 552 (1978). The Internal Revenue Service contends the documents are exempt from disclosure under the Freedom of Information Act, 5 U.S.C. §§ 552b(3), and (b)(7)(A) (1978), and the Internal Revenue Code, 26 U.S.C. § 6103(e)(7). The appellants contend the Internal Revenue Service did not provide a sufficient factual basis and justification for their claimed exemptions from disclosure. We conclude the Internal Revenue Service has sufficiently demonstrated the withheld documents are exempt from disclosure under the Freedom of Information Act and therefore affirm the court below.
I. BACKGROUND
The Internal Revenue Service is conducting a civil and criminal investigation into the tax liabilities of Ralph H. Currie for the tax years 1975 through 1978 and a civil investigation into the tax liabilities of Carpets by Ralph Currie, Inc., for the tax years 1976 through 1978. The appellants filed a Freedom of Information Act (FOIA), 5 U.S.C. § 552 (1978), request with the Internal Revenue Service (IRS) seeking the release of certain documents1 within the control of the IRS relating to the IRS’s investigation of their tax liabilities. The IRS released part of the documents covered by the FOIA request but refused to disclose the remainder of the documents,2 contending the undisclosed documents were exempt from disclosure pursuant to Exemption 3, 5 U.S.C. § 552(b)(3), and Exemption 7(A), 5 U.S.C. § 552(b)(7)(A),3 of the FOIA and [526]*526pursuant to Sections 6103(c) and (e)(6)4 of the Internal Revenue Code of 1954, 26 U.S.C. §§ 6103(c) and (e)(6). After the IRS failed to timely process and respond to an administrative appeal, the appellants filed this action in the district court seeking production of the withheld documents.5
The district court found the withheld material was not subject to disclosure pursuant to 26 U.S.C. § 6103 and alternatively, that the withheld material was exempt from disclosure under the Freedom of Information Act’s Exemption 3, 5 U.S.C. § 552(b)(3), and Exemption 7(A), 5 U.S.C. § 552(b)(7)(A).6 The district court also denied the appellants’ request for an order requiring the IRS to submit an index detailing each withheld document and justifying the exemption from disclosure pertaining to each document. From the grant of summary judgment in favor of the IRS, the appellants bring this appeal pursuant to 28 U.S.C. § 1291 (1978).
II. DISCUSSION
The IRS contends that I.R.C. § 6103, 26 U.S.C. § 6103, is a self-contained statutory scheme regulating the disclosure of tax return information and therefore the disclosure or nondisclosure of such information is not subject to the FOIA and its concomitant procedural requirements and policy objectives. Judicial review of the agency’s [527]*527decision to withhold these documents, they argue, is limited to a determination of whether the decision was arbitrary or an abuse of discretion. We disagree»
Exemption 3 of the FOIA, 5 U.S.C. § 552(b)(3), provides that the FOIA’s disclosure requirements do not apply to matters specifically exempted from disclosure by another statute, provided the statute meets particular criteria.7 In Chamberlain v. Kurtz, 589 F.2d 827 (5th Cir.1979), cert. denied 444 U.S. 842, 100 S.Ct. 82, 62 L.Ed.2d 54 (1980), this court’s predecessor8 determined that 26 U.S.C. § 6103 satisfied the criteria of Exemption 3 after extensively analyzing the language of Section 6103 and the legislative history of Exemption 3 and Section 6103. Accordingly, the court held that tax return information, as defined in 26 U.S.C. § 6103(b)(2),9 is not subject to disclosure pursuant to 26 U.S.C. § 6103(e)(6) (now codified as 26 U.S.C. § 6103(e)(7),10 where the IRS can demonstrate the release of the information would seriously impair federal tax administration. Id. at 838-40. Importantly, the court viewed the nondisclosure of the requested information as an exemption from the normal policy of full disclosure under the FOIA.
The IRS’s contention that Section 6103 is a self-contained scheme governing disclosure derives from a line of cases having their genesis in Zale Corporation v. IRS, 481 F.Supp. 486 (D.D.C.1979). Judge Gesell, in a well-reasoned opinion, determined that Section 6103 is the sole standard governing the release of tax return information. Id. at 490. Therefore the court limited judicial review of the IRS’s determination on disclosure not to the FOIA required de novo review, but rather to a determination consistent with the Administrative Procedure Act, 5 U.S.C. §§ 701 et seq., of whether the decision was rational and supported by the record. Id. at 490.11 Any other construction, it was concluded, would render Section 6103 a “legislative futility.” Judge Gesell reasoned:
[T]he structure of section 6103 is replete with elaborate detail identifying the discrete groups to whom disclosure of certain specified types of information is permissible. In this respect it differs markedly from the structure of FOIA, which calls for the release of information to the public at large with no showing of need required. Despite ample indication in the legislative history that Congress was aware of FOIA while it labored over the tax reform .legislation, there is no evidence of an intention to allow that Act to negate, supersede, or otherwise frustrate the clear purpose and structure of § 6103. For a court to decide that the generalized strictures of FOIA take precedence over this subsequently enacted, particularized disclosure scheme would in effect render the tax reform provision an exercise in legislative futility. Absent an indication that Congress so intended, this Court will not imply such a prospective pre-emption by FOIA.
481 F.Supp. at 489 (footnotes omitted).
The IRS nonetheless argues Zale and Chamberlain can be reconciled because Chamberlain never addressed the question of whether Section 6103 is the sole standard governing disclosure of tax return information.12 Accordingly, they argue we are free to follow Zale and declare Section 6103 is [528]*528both an Exemption 3 statute and a self-contained disclosure statute. We decline to do so. For the court to follow Zale would be an exercise in judicial futility. District courts would be compelled to engage in both FOIA and Zale analyses when confronted with cases such as this. Bonner v. City of Prichard, 661 F.2d 1206 (11th Cir.1981). (Prior decisions of the Eleventh Circuit, including decisions of the Former Fifth Circuit adopted as precedent by the Eleventh Circuit, may be overruled only by the Eleventh Circuit sitting en banc). See also, United States v. McIver, 688 F.2d 726 (11th Cir.1982). Indeed, such a procedure was employed in this case. Once a district court has analyzed a case under the strictures of FOIA it is unnecessary for it to engage in the Zale analysis; a nondisclosure decision that passes muster under the “tougher” FOIA requirements will have a rational basis. Such needless use of scarce judicial resources is not to be encouraged.
The appellants contend that the district court erred in finding all of the documents are exempt from disclosure under the FOIA. In reviewing determinations under the FOIA, we must determine (1) whether the district court had an adequate factual basis for its determination and (2) assuming an adequate factual basis, whether the court’s determination was clearly erroneous. Chilivis v. Securities and Exchange Commission, 673 F.2d 1205, 1210 (11th Cir.1982); Stephenson v. IRS, 629 F.2d 1140, 1144 (5th Cir.1980). We hold that the court below did have a sufficient factual basis for its determination and that its determination was not clearly erroneous.
The appellants argue the IRS has failed to support adequately its claim for exemption from disclosure under the FOIA. At the outset of these proceedings the appellants filed a motion requesting that the district court order the IRS to submit to them a Vaughn v. Rosen13 index setting forth an index of the documents, the exemptions from disclosure claimed for each document, and the factual basis for the claimed exemption. See Stephenson v. IRS, 629 F.2d at 1144. The district court deferred ruling on the motion until it had considered the IRS’s motion for summary judgment. The IRS supported its motion for summary judgment with affidavits of IRS personnel14 which briefly outlined the [529]*529exemptions claimed and the harm that would flow from disclosure. However, after the decision in Stephenson v. IRS, supra, which held similar affidavits15 were insuffi[530]*530dent to satisfy the government’s burden of proof in FOIA cases, Id. at 1145, the IRS tendered all of the disputed documents to the court for an in camera inspection together with individual cover sheets for each document. The cover sheets set forth the claimed exemptions applicable to that document, the extent to which the document was withheld, an explanation relative to the claimed exemption, and the harm flowing from disclosure of that document. After consideration of the documents and the cover sheets, the district court denied the motion for a Vaughn v. Rosen index and granted summary judgment in favor of the IRS.
The appellants contend the conclusory affidavits submitted by the IRS to support the claimed exemption, together with the lack of a Vaughn v. Rosen index, did not provide the district court with a sufficient factual basis for the determination of the correctness of the IRS’s claim for exemption from disclosure. The appellants misconstrue the import of Stephenson. In Stephenson it was held that in an FOIA case it is insufficient for the district court to rely entirely on affidavits similar to those in the present case where the disputed documents do exist. Id. The Stephenson court required more of the district court to assure itself of the “factual basis and bona fides of the agency’s claims of Exemption.” Id. Alternative procedures were recommended including sanitized indexing, oral testimony, and random sampling of the documents in camera. Id. However, these procedures are substitutes to a complete in camera inspection of all the documents. Id. at 1144. The district court’s review of the claim for exemption was adequate; it reviewed the documents in their entirety aided by the cover sheets prepared by the IRS. Resort to an in camera inspection is discretionary with the court, 5 U.S.C. § 552(a)(4)(B), and the court’s management of the case will not be disturbed absent an abuse of discretion. Chamberlain v. Kurtz, 589 F.2d at 835. We find no abuse of discretion in this case.
The FOIA was designed to encourage open disclosure of public information. Baldrige v. Sharpio, 455 U.S. 345, 102 S.Ct. 1103, 71 L.Ed.2d 199 (1982). To achieve this end, documents held by government agencies are presumed subject to disclosure unless, after a de novo review of the government’s determination not to disclose, the agency has carried the burden of proving the withheld materials are within one of the exemptions of the FOIA. 5 U.S.C. § 552(a)(4)(B); Chilivis v. Securities and Exchange Commission, 673 F.2d at 1210-11; McCorstin v. U.S. Department of Labor, 630 F.2d 242 (5th Cir.1980). To facilitate this review the courts often rely upon indices such as a Vaughn v. Rosen index in evaluating the claims of exemption as they apply to the withheld documents. Although lack of access to such indices by the party seeking disclosure “undercuts the traditional adversarial theory of judicial dispute resolution,” Mead Data Central, Inc. v. U.S. Department of the Air Force, 566 F.2d 242, 250 (D.C.Cir.1977); Vaughn v. Rosen, 484 F.2d at 824, the role of the courts in a suit under the FOIA in effectively determining the propriety of a government agency’s decision to withhold material is not completely frustrated by an in camera inspection of the disputed documents with accompanying cover sheets such as employed in this case. Thorough in camera inspection of the withheld documents where the information is extensive and the claimed exemptions are many, however, is not the preferred method of determining the appropriateness of the government agency’s characterization of the withheld information. Testing the ac[531]*531curacy of the agency’s characterization where the documents run into the hundreds and thousands of pages is too burdensome a task to be placed upon trial judges without the aid of a focused inquiry brought about by the adversarial process. At the appellate level the burden of reviewing the trial court’s determination “without the controverting illumination that would ordinarily accompany a request to review a lower court’s determination,” Vaughn v. Rosen, 484 F.2d at 825, is overwhelming without the commitment of enormous judicial resources. Because of self-evident necessity, the appellants in this case were unable to fully develop their presentation which makes our task that much more difficult. Also, the district court’s opinion is stated in conclusory terms which further compounds our burden of inquiring into the appropriateness of the district court’s determination. The procedure employed in this case, therefore, is to be utilized in only the rare case such as this where the disputed documents are relatively brief, few in number, and where there are few claimed exemptions.
Having decided the district court had an adequate factual basis for its determination of the propriety of the nondisclosure of the documents at issue, we must ascertain whether the district court’s determination was clearly erroneous. To qualify for exemption under 5 U.S.C. § 552(b)(3) pursuant to 26 U.S.C. § 6103(e)(7), the IRS must demonstrate that two criteria have been met:16 (1) the documents must constitute “return information” as defined by 26 U.S.C. § 6103(b)(2),17 and (2) disclosure of which would seriously impair federal tax administration. The district court concluded the IRS had established that the documents met both criteria. Because we conclude that this determination was not clearly erroneous, we affirm the court below.
Appellants argue that not all of the withheld material is return information. In conjunction with this argument, they contend that even if all of the material is properly characterized as return information the IRS is under an obligation to delete identifying material and disclose the remainder to the requesting party. These contentions are without merit. The documents at issue consist of internal agency memoranda reflecting the direction and scope of the investigation of the appellants’ tax liability, memoranda of interviews with witnesses and confidential informants, draft affidavits of confidential informants, correspondence with a state law enforcement agency and other third parties, information received from third parties relating to financial transactions with the appellants, federal tax returns of third parties, and IRS personnels’ notes and work papers concerning the scope and direction of the investigation. Clearly the withheld materials constitute “data received by, recorded by, prepared by, furnished to, or collected by the Secretary with respect to a return” because they were compiled pursuant to an investigation into the potential liability for deficiencies or penalties by the appellants. See Chamberlain v. Kurtz, supra at 840-41.
The appellants’ contention that the import of the last proviso of Section 6103(b)(2) (“but such term does not include data in a form which cannot be associated with, or otherwise identify, directly or indirectly, a particular taxpayer”), the so-called Haskell Amendment to the Tax Reform Act of 1976, means that after deletion of “identifying matter” return information is disclosable is equally without merit. The Haskell Amendment, by its own force and effect, does not require the release of return information if exempt material is readily excisable. The amendment was intended to neither enhance nor diminish the access to information under the FOIA. 122 Cong.Rec. S24012 (daily ed. July 27, 1976) (re[532]*532marks of Sen. Haskell).18 It was intended only to allow release of statistical studies and compilation of data by the IRS to, inter alia, committees of Congress. King v. IRS, 688 F.2d 488, 492-93 (7th Cir.1982); Cliff v. IRS, 496 F.Supp. 568, 573-74 (S.D.N.Y.1980). Cf. Long v. IRS, 596 F.2d 362 (9th Cir.1979), cert. denied 446 U.S. 917, 100 S.Ct. 1851, 64 L.Ed.2d 271 (1980). (Taxpayer request for the source material relative to the IRS’s Taxpayer Compliance Measurement Program obtainable if there were no significant risk or identifying any particular taxpayer) (Result overruled by Act of August 13, 1982, Pub.L. No. 97-34, Title VII, ¶ 701(a), 95 Stat. 340 (1981). Therefore, we conclude the IRS is under no obligation to delete identifying matter from the documents and that all the withheld material is return information.
An examination of the documents and the cover sheets reveals the harm that would flow from the release of these documents. The release of the documents would hamper the investigation by disclosing the names of confidential informants, the substance of their testimony, the scope, direction, and strength of the investigation, and confidential information about third parties. Such disclosure would reveal the government’s case prematurely, could result in witness intimidation, and effectively thwart the IRS’s duty to enforce the revenue laws. Cf. NLRB v. Robbins Tire & Rubber Company, 437 U.S. 214, 98 S.Ct. 2311, 57 L.Ed.2d 159 (1978) (Exemption 7(A) of the FOIA, 5 U.S.C. § 552(b)(7)(A), which provides that disclosure is not required of matters “that are investigatory records compiled for law enforcement purposes, but only to the extent that the production of such records would ... interfere with enforcement proceedings,” was designed to avoid premature release of investigatory data including witnesses’ statements.)
Our decision on the Exemption 3 issue makes it unnecessary for us to consider the propriety of the Exemption 7(A), (C) and (D) claims. Therefore, the judgment of the district court is:
AFFIRMED.