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Seventy-ninth Annual Report of the Pennsylvania Agricultural Experiment Station, July 1, 1965-June 30, 1966
Clarence Earl Trotter
G. W. Gorsline
Hays Bentley Gamble
Pennsylvania State University. Agricultural Experiment Station
Reed D. Taylor
Wayne A. Schutjer
出版
Pennsylvania State University, College of Agriculture, Agricultural Experiment Station
, 1967
URL
http://books.google.com.hk/books?id=mtlPAQAAMAAJ&hl=&source=gbs_api