TY  - RPRT
TI  - Geologic map of the Rio Grande Quadrangle, Puerto Rico
AU  - M. H. Pease
AU  - R. P. Briggs
PY  - 1972
DO  - 10.3133/i733
UR  - https://pubs.usgs.gov/publication/i733
ID  - i733
ER  -