TY - RPRT TI - Ground-water levels in alluvium on the south coast of Puerto Rico, February 1979 AU - Eloy Colon-Dieppa AU - J.R. Gonzalez PY - 1981 DO - 10.3133/ofr81641 UR - https://pubs.usgs.gov/publication/ofr81641 ID - ofr81641 ER -