00000cam a22000004i 4500 UP-99796217612497058 Buklod 20170615160120.0 a r |||| u| ta 970313s2002 dcuab rb f000 0|eng d 0607872071 (iLib)UPD-00264107482 DLC DGEO rda eng TD 427.N5 C73 1997 Cravotta, Charles A. Use of stable isotopes of carbon, nitrogen, and sulfur to identify sources of nitrogen in surface waters in the lower Susquehanna River Basin, Pennsylvania by Charles A. Cravotta, III. [Washington, D.C. U.S. G.P.O.] Denver CO For sale by the U.S. Geological Survey, Branch of Information Services [2002] v, 99 p. ill., map 28 cm. text rdacontent unmediated rdmedia volume rdacarrier "Prepared in cooperation with the Pennsylvania Department of Environmental Protection." Includes bibliographical references (p. 63-68). Nitrogen Environmental aspects Susquehanna River Watershed. Water Pollution Susquehanna River Watershed Point source identification. Radioactive tracers in water pollution research Susquehanna River Watershed. Pennsylvania. Department of Environmental Protection. Geological Survey (U.S.). FO UPD DGEO TD 427.N5 C73 1997 Book