TY  - RPRT
TI  - Concentrations and possible sources of nitrate in water from the Silurian-Devonian aquifer, Cedar Falls, Iowa
AU  - Bryan D. Schaap
PY  - 1999
DO  - 10.3133/wri994106
UR  - https://pubs.usgs.gov/publication/wri994106
ID  - wri994106
ER  -