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Eighty-fourth Annual Report of the Pennsylvania Agricultural Experiment Station, July 1, 1970 to June 30, 1971
Dennis K. Smith
James Joseph Ruane
Donald M. Crider
J. Patrick Madden
Milton C. Hallberg
Pennsylvania State University. Agricultural Experiment Station
Roy 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