TY  - RPRT
TI  - Use of isotopically labeled fertilizer to trace nitrogen fertilizer contributions to surface, soil, and ground water
AU  - D.H. Wilkison
AU  - D. W. Blevins
AU  - S. R. Silva
PY  - 2000
UR  - https://pubs.usgs.gov/publication/70010279
ID  - 70010279
ER  -