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A Provisional Tree Seed-zone and Cone-crop Rating System for Arizona and New Mexico
Gilbert Herman SchubertJohn A. Pitcher
出版Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, 1973
URLhttp://books.google.com.hk/books?id=sb9XB2YS6psC&hl=&source=gbs_api
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