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Dear Mr. Harrison,
Thank you for posting your request on History Hub!
We searched the Records of the American Expeditionary Forces (World War I) (Record Group 120) and located records of the Headquarters Battalion of American Commission to Negotiate Peace that acted as the administrative unit (NM-91 Entries 1625-1627). The report you seek maybe part of these records. In additional, we suggest that you search the Records of the American Commission to Negotiate Peace, 1914 - 1931 (Record Group 256). Most of these records are available on microfilm. For access to these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
We hope this information is helpful. Best of luck with your research!