TY  - RPRT
TI  - Geologic map of the Yabucoa and Punta Tuna quadrangles, Puerto Rico
AU  - C.L. Roberts
AU  - C. M. Cram
AU  - M. H. Pease
AU  - M. S. Tischler
PY  - 1979
DO  - 10.3133/i1086
UR  - https://pubs.usgs.gov/publication/i1086
ID  - i1086
ER  -