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For those that are interested in how Pearl Harbor was investigated beginning in late 1945 and lasting till May 1946.

A chronological chart of the investigations from the "Dorn Report".
Use a hyperlinked map of the Investigations to navigate or scroll down.
http://www.ibiblio.org/pha/pha/file_map.html

The "NINE INVESTIGATIONS" in chronological order:
http://www.ibiblio.org/pha/pha/invest.html

The Knox Investigation http://www.ibiblio.org/pha/pha/knox/knox_0.html
Dec. 9-14, 1941.

The Roberts Commission http://www.ibiblio.org/pha/pha/roberts/roberts.html
Dec. 18-January-23, 1941

The Hart Investigation http://www.ibiblio.org/pha/pha/hart/hart-00.html
Feb. 12-June 15, 1944

The Army Pearl Harbor Board http://www.ibiblio.org/pha/pha/army/chap_0.html
Jul. 20-Oct. 20, 1944

The Navy Court of Inquiry http://www.ibiblio.org/pha/pha/navy/navy_0.html
Jul. 24-Oct. 19, 1944.

The Clarke Investigation http://www.ibiblio.org/pha/pha/clarke/clarke_0.html
Aug. 4-Sep 20, 1944

The Clausen Investigation
http://www.ibiblio.org/pha/pha/clausen/clausen.html
Jan. 24-Sep. 12, 1945

The Hewitt Inquiry http://www.ibiblio.org/pha/pha/hewitt/hewitt-0.html
May 14-July 11, 1945

The Joint Congressional Committee
http://www.ibiblio.org/pha/pha/congress/part_0.html
Nov. 15, 1945-May 23, 1946
==========================
Suggested research path:

The Joint Congressional Committee
http://www.ibiblio.org/pha/pha/congress/part_0.html
Table of Contents gives a good over-view of the Report
and the Report itself refers back to the previous reports.

The Pearl Harbor Investigation Listing
http://www.ibiblio.org/pha/pha/invest.html
including the Joint Congressional Committee report and
the other eight official investigations
into the attack.

The Listing of Additional Files
http://www.ibiblio.org/pha/pha/extra.html
Holds several items that are of interest but weren't included in all of the
proceedings.

Naval Historical Center Images of Pearl Harbor
http://www.history.navy.mil/photos/events/wwii-pac/pearlhbr/pearlhbr.htm

Photographic collections related to Pearl Harbor
http://ibiblio.org/pha/images/index.html

A Chronological Collection of Documents Relating to the U.S. Entry Into WWII
http://ibiblio.org/pha/timeline/ (Four parts)
    Magic intercepts listed in the Pearl Harbor Attack Hearings.
    Communications between Washington and the US embassy in Tokyo, other
    relevant US documents.
    International chronology, listing various documents from around the world
    Military document chronology, listing important military plans, studies and   communications.

Japanese Operational Monograph No. 97 PEARL HARBOR OPERATIONS:

General Outline of Orders and Plans http://www.ibiblio.org/pha/myths/jm-097.html
was rewritten in English by the Japanese Research Division, Military History
Section, Headquarters, Army Forces Far East and is based on the translation
of the Japanese original.

Pearl Harbor Revisionism
http://www.geocities.com/Athens/3682/phrevisionism.html
First Order revisionism holds President Franklin D. Roosevelt personally
responsible for the debacle at Pearl Harbor and regards him as having used
the incident as a means to get the United States involved in the War and
subsequently used the Hawaiian commanders as scapegoats to shift public
attention away from the activities of the Administration.