TY  - RPRT
TI  - Ground-water levels on the south coast of Puerto Rico, February 1974 to February 1975
AU  - Jose R. Diaz
PY  - 1976
DO  - 10.3133/ofr76625
UR  - https://pubs.usgs.gov/publication/ofr76625
ID  - ofr76625
ER  -