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Google圖書搜尋
The Commercial Grading of Corn, by Carl S. Scofield ... [Preface by Frederick V. Cowille.].
Carl Schurz Scofield
出版
U.S. Government Printing Office
, 1903
URL
http://books.google.com.hk/books?id=7BoPYAAACAAJ&hl=&source=gbs_api