Impacts of Technology on U.S. Cropland and Rangeland Productivity (United States. Congress. Office of Technology Assessment)

Impacts of Technology on U.S. Cropland and Rangeland Productivity (1982), by United States Congress Office of Technology Assessment (stable link)
New Online Books
http://onlinebooks.library.upenn.edu/webbin/book//lookupid?key=olbp68711

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