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200 10$aCounty-level estimates of nitrogen and phosphorus from animal manure for the conterminous United States : 2007 and 2012
210   $aReston, Virginia$cU.S. Department of the Interior, U.S. Geological Survey
517   $aCounty-level estimates of nitrogen and phosphorus from animal manure for the conterminous United States 
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996   $aCounty-level estimates of nitrogen and phosphorus from animal manure for the conterminous United States : 2007 and 2012$93350133
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