TY  - RPRT
TI  - Use of stable isotopes of carbon, nitrogen, and sulfer to identify sources of nitrogen in surface waters in the Lower Susquehanna River basin, Pennsylvania
AU  - C.A. Cravotta
PY  - 1995
DO  - 10.3133/ofr94510
UR  - https://pubs.usgs.gov/publication/ofr94510
ID  - ofr94510
ER  -