TY - RPRT TI - Ground-water quality at selected sites throughout Puerto Rico, September 1982-July 1983 AU - Senen Guzman-Rios AU - Ferdinand Quinones PY - 1984 DO - 10.3133/ofr8458 UR - https://pubs.usgs.gov/publication/ofr8458 ID - ofr8458 ER -