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The image sent to you by E. Schneider is from the National Archives Catalog and located in the series Registers of Deaths in the Regular Army, 1860 - 1889 in the Records of the Adjutant General's Office, 1762 - 1917 (Record Group 94) that includes a file for William George. He is listed in Vol. 7.
You can also request older military personnel records from the Textual records division (RDT1) at the National Archives at Washington, D.C. by emailing email@example.com.
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