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State Soil Conservation Program for Maryland (revised)
其他書名
(predicated Upon the Report of the Secretary's Committee, Dated June 5, 1935 and Memorandum of Understanding Between the Extension Service and the Soil Conservation Service).
出版1938
URLhttp://books.google.com.hk/books?id=3MQXtwAACAAJ&hl=&source=gbs_api