TY  - RPRT
TI  - Geologic map of the Yabucoa and Punta Tuna quadrangles, Puerto Rico
AU  - Cleaves Lincoln Rogers
AU  - C. M. Cram
AU  - M. H. Pease
AU  - M. S. Tischler
PY  - 1977
DO  - 10.3133/ofr77651
UR  - https://pubs.usgs.gov/publication/ofr77651
ID  - ofr77651
ER  -