Half a ton of butter per cow per year Van Pelt, Hugh G. creator text book Philadelphia Wilmer Atkinson Co 1910 1910 [1st ed. 10th thousand]
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ENG Butter Dairying SF263 .V3 https://www.biodiversitylibrary.org/bibliography/35775 15581199 11001162 10.5962/bhl.title.35775 DLC