TY  - RPRT
TI  - References on the geology of Puerto Rico supplementary to the Bibliography and index of the geology of Puerto Rico and Vicinity, 1866-1968
AU  - Marjorie Hooker
PY  - 1973
DO  - 10.3133/ofr73118
UR  - https://pubs.usgs.gov/publication/ofr73118
ID  - ofr73118
ER  -