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Eighty-first Annual Report of the Pennsylvania Agricultural Experimental Station, July 1, 1967 to June 30, 1968

Donald R. StreetEdgar John BattisonHarold Gene MarshallHarold H. TaylorJames C. BarronNeil B. GingrichRodney Dwain HorrocksPennsylvania State University. Agricultural Experiment Station

出版	Pennsylvania State University, College of Agriculture, Agricultural Experiment Station, 1968
URL	http://books.google.com.hk/books?id=e9lPAQAAMAAJ&hl=&source=gbs_api