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Dear Mr. Burnett,
Thank you for posting your request on History Hub.
We searched the National Archives Catalog and located a file unit (HA-127, M/Sgt. Abie Abrahams) and a shot card for the filming of General Homma's War Crimes Trial. We were unable to locate any other specific records for Abraham. His testimony would be part of the trial record and any documents pertaining to grave registration would be filed with each serviceman’s 293 file or burial file.
There is an article by Arab American Institute that summaries his life avilable at http://www.aaiusa.org/together_we_came_abie_abraham.
We hope this information is helpful. Best of luck with your research!