01550oam 2200457 450 991071532160332120210305113255.0(CKB)5470000002510821(OCoLC)1086487393(OCoLC)974647226(OCoLC)1084208596(OCoLC)995470000002510821(EXLCZ)99547000000251082120190220d1991 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierExternal quality-assurance results for the National Atmospheric Deposition Program/National Trends Network during 1989 /by Timothy C. Willoughby [and three others]Denver, Colorado :U.S. Geological Survey,1991.1 online resource (iv, 26 pages) illustrations, mapWater resources investigations report ;91-4039Includes bibliographical references (page 26).Acid depositionUnited StatesAcid depositionfastUnited StatesfastAcid depositionAcid deposition.Willoughby Timothy C.1396388Geological Survey (U.S.),OCLCEOCLCEOCLCQOCLCOCOPOCLCFOCLCQGPOBOOK9910715321603321External quality-assurance results for the National Atmospheric Deposition Program3536099UNINA