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A Pasture Handbook

Arthur Truman Semple

出版	United States Department of Agriculture, 1940
URL	http://books.google.com.hk/books?id=6mN00AEACAAJ&hl=&source=gbs_api

註釋

Advancement in the management of pastures, meadows, and ranges, and realization that these crops contribute to soil conservation and to efficient farming, have been salutary developments in the farm program in recent years.