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Eighty-fourth Annual Report of the Pennsylvania Agricultural Experiment Station, July 1, 1970 to June 30, 1971

Dennis K. SmithDonald M. CriderJ. Patrick MaddenJames Joseph RuaneMilton C. HallbergPennsylvania State University. Agricultural Experiment StationRoy O. Herrmann

出版	Pennsylvania State University, College of Agriculture, Agricultural Experiment Station, 1971
URL	http://books.google.com.hk/books?id=GF9RAQAAMAAJ&hl=&source=gbs_api