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A Study of Breeding Records in Dairy Herds

Dwight Moody SeathC. Henry StaplesE. W. Neasham

出版	Louisiana State University and Agricultural and Mechanical College, Agricultural Experiment Stations, 1943
URL	http://books.google.com.hk/books?id=FgikP0zQCL0C&hl=&source=gbs_api