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Following the Contour

其他書名	How to Strip-crop Iowa Land
出版	Agricultural Experiment Station, Agricultural Extension Service, Iowa State College, 1943
URL	http://books.google.com.hk/books?id=_hsiAQAAMAAJ&hl=&source=gbs_api

註釋"The purpose of this bulletin is to describe that phase of contour farming known as strip cropping." -- p. [731]