Books by Calvin D. Cowles:
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Cowles, Calvin D. (Calvin Duvall), 1849-: Genealogy of the Cowles Families in America (2 volumes; New Haven, CT: Tuttle, Morehouse and Taylor, 1929) (page images at HathiTrust)
Additional books by Calvin D. Cowles in the extended shelves:
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Cowles, Calvin D. (Calvin Duvall), 1849-: Official records of the Union and Confederate armies (Government Printing Office, 1880), also by United States War Department, John S. Moodey, Fred C. Ainsworth, Joseph W. Kirkley, Leslie J. Perry, George B. Davis, H. M. Lazelle, Robert N. Scott, United States House of Representatives, United States. Record and Pension Office, and United States. War Records Office (page images at HathiTrust)
Find more by Calvin D. Cowles at your library, or elsewhere.