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Google圖書搜尋
Butterfat Procurement by Creameries in Butler County, Iowa
Paul Elmer Quintus
Frank Robotka
出版
Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts
, 1939
URL
http://books.google.com.hk/books?id=Q51RAQAAMAAJ&hl=&source=gbs_api