TY  - RPRT
TI  - Hornblende-plagioclase porphyry intrusives in the northeast quarter of the Ponce quadrangle, Puerto Rico
AU  - R.D. Krushensky
PY  - 1971
DO  - 10.3133/ofr71176
UR  - https://pubs.usgs.gov/publication/ofr71176
ID  - ofr71176
ER  -