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Eighty-sixth Annual Report of the Pennsylvania Agricultural Experiment Station, July 1, 1972 to June 30, 1973
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=HZoyzgEACAAJ&hl=&source=gbs_api