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Cone Crops of Ponderosa Pine in Central Arizona, Including the Influence of Abert Squirrels
Merlyn Milfred LarsonGilbert Herman Schubert
出版Rocky Mountain Forest and Range Experiment Station, 1970
URLhttp://books.google.com.hk/books?id=Lujxq4gHL70C&hl=&source=gbs_api
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