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Yields of Barley Varieties in the United States and Canada, 1932-36
Gustav A. WiebeLucille Reinbach-WelchPhilip Russell Cowan
出版U.S. Department of Agriculture, 1940
URLhttp://books.google.com.hk/books?id=OUfxLocnpKkC&hl=&source=gbs_api
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