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Dear Mr. Schneider,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog, various unit record files in the Records of U.S. Army Operational, Tactical, and Support Organizations (World War II and Thereafter) (Record Group 338), and various Reserve Schools in the Records of Headquarters Army Ground Forces (Record Group 337) but were unable to locate records of the St. Louis USAR School or the 5908th ARSU for 1958.
We hope this information is helpful.