TY  - RPRT
TI  - Assessment of nitrate contamination of the upper aquifer in the Manati-Vega Baja area, Puerto Rico
AU  - Carlos Conde-Costas
AU  - Fernando Gómez-Gómez
PY  - 1999
DO  - 10.3133/wri994040
UR  - https://pubs.usgs.gov/publication/wri994040
ID  - wri994040
ER  -