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Dear Mr. Hope,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located two series -- Correspondence and Other Records Relating to Buildings in France Available for Hospitals, 1917 - 1919 that may include the Château la Roche and Records of Camp Hospitals, 1917 - 1919 in the Records of the American Expeditionary Forces (World War I) (Record Group 120) that include files pertaining to the Camp Hospital No. 78 while it was stationed at the Château la Roche. Camp Hospital No. 54 was redesignated as Camp Hospital No. 78 and the records have been consolidated.
For access to and/or copies of 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!