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Eighty-Seventh Annual Report of the Pennsylvania Agricultural Experiment Station July 1, 1973, to June 30, 1974
Pennsylvania State University. Agricultural Experiment Station
出版
Pennsylvania State University, College of Agriculture, Agricultural Experiment Station
, 1974
URL
http://books.google.com.hk/books?id=i5WSXwAACAAJ&hl=&source=gbs_api