The dairy cow. A monograph on the Ayrshire breed of cattle Sturtevant, E. Lewis (Edward Lewis), 1842-1898 creator Sturtevant, Joseph N. contributor text book Boston A. Williams and company 1875 1875
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ENG Ayrshire cattle Milk SF199.A9 S8 https://www.biodiversitylibrary.org/bibliography/28917 3535997 agr07001188 10.5962/bhl.title.28917 U. S. Dept. of Agr. Library