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Dear Ms. Ballog,
Thank you for posting your request on History Hub!
We searched the series titled Records of Cook Companies, 1918 - 1919 in the Records of the American Expeditionary Forces (World War I) (Record Group 120) and located approximately 1,500 pages of 3rd Cook Company correspondence and general orders for 1918-1919. For access and copies of these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
We were not able to locate specific records of a unit designated as 76th Provisional Company September Auto Replacement.
We hope this information is helpful. Best of luck with your research!