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An Improved Elevator for Deep Bin Potato Storages

Alfred Douglas EdgarArchie Hubbard GlavesJohn Cornelius Hansen

出版	U.S. Department of Agriculture, Agricultural Marketing Service, 1956
URL	http://books.google.com.hk/books?id=pc88AAAAYAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN