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- Title from title screen (viewed Nov. 9, 2010).
- Horowitz, John. , Ebel, Robert. , Ueda, Kohei 1981- , United States Dept. of Agriculture. Economic Research Service.
- No-tillage , United States , Statistics , Agricultural surveys , United States , tillage , Agricultural Resource Management Study , cropping systems , Conservation Effects Assessment Project , carbon sequestration , United States
- Title from title screen (viewed on Sept. 30, 2010).
- Gerling, Michael W. , Tran, HoaiNam N. , Earp, Morgan S. , United States National Agricultural Statistics Service. Research and Development Division.
- Agricultural surveys , United States , Nonresponse (Statistics) , agricultural statistics , surveys , data collection , Agricultural Resource Management Study , Washington