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Descriptions of types of principal American varieties of orange-fleshed carrots. Prepared jointly by specialists of the United States Department of Agriculture, Cornell University, and the Experiment Stations of California, Louisiana, Minnesota, Texas, and Virginia. [By Roy Magruder, and others]
出版U.S. Government Printing Office, 1940
URLhttp://books.google.com.hk/books?id=7jJF0AEACAAJ&hl=&source=gbs_api