01673oam 2200421 a 450 991070245020332120130204134535.0(CKB)5470000002427667(OCoLC)819334666(EXLCZ)99547000000242766720121126d2012 ua 0engurcn|||||||||txtrdacontentcrdamediacrrdacarrierCounty-level estimates of nitrogen and phosphorus from commercial fertilizer for the conterminous United States, 1987-2006[electronic resource] /by Jo Ann M. Gronberg and Norman E. SpahrReston, Va. :U.S. Dept. of the Interior, U.S. Geological Survey,2012.1 online resource (vi, 20 pages) color illustrationsScientific investigations report ;2012-5207Title from title screen (viewed on Nov. 26, 2012)."National Water-Quality Assessment Program."Includes bibliographical references (pages 17-18).Nitrogen fertilizersUnited StatesPhosphatic fertilizersUnited StatesNitrogen fertilizersPhosphatic fertilizersGronberg JoAnn M1384896Spahr Norman E1384575Geological Survey (U.S.)National Water-Quality Assessment Program (U.S.)AZSAZSGPOBOOK9910702450203321County-level estimates of nitrogen and phosphorus from commercial fertilizer for the conterminous United States, 1987-20063526904UNINA