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Effects of Different Sources of Fertilizer Nitrogen on Growth and Nutrition of Western Hemlock Seedlings

M. A. RadwanDean S. DeBell

出版	Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1980
URL	http://books.google.com.hk/books?id=e_u7prX9AuYC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN