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Pears (Oregon - Except Hood River)

Robert Lloyd StebbinsRobert L. RackhamErnest Hugh GardnerMichael Hovey ChaplinPorter B. Lombard

出版	Oregon State University, Extension Service, 1976
URL	http://books.google.com.hk/books?id=z1GllwEACAAJ&hl=&source=gbs_api