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Practices Responsible for Variations in Physical Requirements and Economic Costs of Milk Production on Wisconsin Dairy Farms
Mordecai Ezekiel
Preston Essex McNall
Frank Barron Morrison
出版
Agricultural Experiment Station, University of Wisconsin
, 1927
URL
http://books.google.com.hk/books?id=Xy0nAQAAMAAJ&hl=&source=gbs_api