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Use of Motion Pictures in Agricultural Extension Work. Fred W. Perkins ... Howard Greene ... and George R. Goergeus ...

Fred W. PerkinsGeorge R. GoergensHoward Greene

出版	U.S. Government Printing Office, 1926
URL	http://books.google.com.hk/books?id=dddRQwAACAAJ&hl=&source=gbs_api