TY  - RPRT
TI  - Analytical results and sample locality map of soil samples from the Tanama-Helecho porphyry copper district, municipios of Utuado and Adjuntas, Puerto Rico
AU  - R. E. Learned
AU  - H. A. Pierce
AU  - Ileana Perez
PY  - 1992
DO  - 10.3133/ofr93179
UR  - https://pubs.usgs.gov/publication/ofr93179
ID  - ofr93179
ER  -