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Land-capability Classification
A. A. Klingebiel
Curtis May
Elbert Luther Little
Frederick Marion Lege
Gertrude Alsager Gronbech
I. E. Stokes
John Charles Walker
Marguerite C. Burk
Robert M. Conlogue
Ruth Olive Ericson
出版
Agricultural Research Service, U.S. Department of Agriculture
, 1961
URL
http://books.google.com.hk/books?id=ki-OvgEACAAJ&hl=&source=gbs_api