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Pear Growing in the Pacific Coast States. (Revised-June 1949.).
Charles Franklin Kinman
U.S. Dept. of Agriculture. Bureau of Plant Industry, Soils, and Agricultural Engineering
John Robert Magness
出版
U.S. Department of Agriculture
, 1949
URL
http://books.google.com.hk/books?id=Hfy4mgEACAAJ&hl=&source=gbs_api