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The Barrel Seed Scarifier
Wilbur Magruder Hurst
U.S. Dept. of Agriculture. Bureau of Plant Industry
Walter Raymond Humphries
Roland McKee
出版
U.S. Government Printing Office
, 1934
URL
http://books.google.com.hk/books?id=vqQ-ngEACAAJ&hl=&source=gbs_api