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Nitrogen and Carbon Changes in Great Plains Soils as Influenced by Cropping and Soil Treatments

Howard J. HaasC. E. EvansE. F. Miles

出版	U.S. Department of Agriculture, 1957
URL	http://books.google.com.hk/books?id=iLYXAAAAYAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN