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The Manuscript Division at the Library of Congress has custody of Dr. John Frederick May's handwritten observations on the assassination of Lincoln and the identification of the body of John Wilkes Booth, dated January 10, 1887 (catalog record). You are welcome to visit the Manuscript Reading Room to consult this item, or place an order for reproductions through the Library's Duplication Services. These observations were also published in the Records of the Columbia Historical Society, Washington, D.C. Vol. 13 (1910), pp. 51-68 (18 pages).
Material related to the trial of the conspirators may be found in the Edwin McMasters Stanton Papers (catalog record), but a more in-depth search of the collection would be necessary to determine whether it includes evidence regarding the identification of Booth’s body. The Stanton Papers are available online (link), and you may wish to begin a search by browsing correspondence and letterbooks chronologically for the year 1865.
The Lincoln Archives has digitized a letter in the custody of the National Archives from Surgeon General J. K. Barnes to Sec. War E. M. Stanton on his postmortem examination of the body of J.W. Booth, April 27, 1865 (link).
Please let us know if we can be of any other help. All the best of luck on your research project!
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Dear Mr. Jacobson,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located correspondence regarding John Wilkes Booth’s autopsy that are in the custody of the National Archives at Washington, DC (RDT1). Please contact them via email at firstname.lastname@example.org.
We hope this is helpful. Best of luck with your research!