TY  - RPRT
TI  - Geologic map of the Ponce Quadrangle, Puerto Rico
AU  - R.D. Krushensky
AU  - W. H. Monroe
PY  - 1975
DO  - 10.3133/i863
UR  - https://pubs.usgs.gov/publication/i863
ID  - i863
ER  -