TY  - RPRT
TI  - Occurrences of alunite, pyrophyllite, and clays in the Cerro La Tiza area, Puerto Rico
AU  - Fred Adelbert Hildebrand
AU  - Raymond J. Smith
PY  - 1959
DO  - 10.3133/ofr5954
UR  - https://pubs.usgs.gov/publication/ofr5954
ID  - ofr5954
ER  -