TY  - BOOK
AU  - Briggs,Reginald Peter
ED  - Puerto Rico.
ED  - Geological Survey (U.S.)  
TI  - Provisional geologic map of Puerto Rico and adjacent islands
T2  - Miscellaneous geologic investigations
PY  - 1964///
CY  - Washington, D.C.
PB  - U.S. Geological Survey
KW  - Geology
KW  - Puerto Rico
KW  - Maps
KW  - Local
KW  - 1964
N1  - Inset: Map showing relative accuracy of parts of the geologic map
ER  -