TY  - RPRT
TI  - Dryland farming and livestock as sources of nitrate in ground water
AU  - Joanna N. Thamke
AU  - David A. Nimick
PY  - 1998
DO  - 10.3133/fs01898
UR  - https://pubs.usgs.gov/publication/fs01898
ID  - fs01898
ER  -