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Dear Ms. Mangler,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 27 series that pertain to Union POWs in the Records of the Commissary General of Prisoners, 1861-1905 (Record Group 249). These records are in the custody of the National Archives at Washington, DC (RDT1). For access to these series, please contact RDT1 via email at firstname.lastname@example.org.
We hope this information is helpful. Best of luck with your research!