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Conserving Farm Lands Planning for Soil-erosion Control, Water Conservation and Efficient Land Use, by Tom Dale ... and W.A. Ross ... [Foreword by J.C. Wright.].

Tom DaleW. A. Ross

出版	U.S. Government Printing Office, 1940
URL	http://books.google.com.hk/books?id=37BFYAAACAAJ&hl=&source=gbs_api