, A.D. O’Rourke, F. Epplin, Dusanee Kesavayuth. 2005. Examining the Sources of Differences in Profitability and Costs for Conservation and Conventional Tillage in Eastern Washington. PNW Conservation Tillage Update. 20(10)(November):1-7.
URL: http://pnwsteep.wsu.edu/tillagehandbook/chapter10/102005.htm
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