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Influence of Type of Hog on Production Efficiency, by J.H. Zeller ... and H.O. Hetzer ...
John Henry Zeller
Herbert Ottmar Hetzer
出版
U.S. Government Printing Office
, 1944
URL
http://books.google.com.hk/books?id=8uD_XwAACAAJ&hl=&source=gbs_api
