TY  - RPRT
TI  - Preliminary geologic map of the Naguabo and part of the Punta Puerca quadrangles, Puerto Rico
AU  - John W. M’Gonigle
PY  - 1977
DO  - 10.3133/ofr77564
UR  - https://pubs.usgs.gov/publication/ofr77564
ID  - ofr77564
ER  -