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Dear Mr. Hildebrand,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 5 series of the 14th Infantry Regiment during the 1870s in the Records of U.S. Regular Army Mobile Units (Record Group 391). One series in particular, Rolls, Returns, and Other Records, 1861-1910 contains muster rolls, monthly returns, a regimental history, and histories of the 14th. For access to and/or copies of these records, please contact the National Archives at Washington, DC - Textual Reference (RDT1) via email at firstname.lastname@example.org.
We hope this information is helpful. Best of luck with your research!