TY  - RPRT
TI  - Geology of the Venezuelan Guayana Shield at 1:500,000 scale; a digital representation of maps published by the U.S. Geological Survey
AU  - Paul G. Schruben
PY  - 1995
DO  - 10.3133/ofr95493
UR  - https://pubs.usgs.gov/publication/ofr95493
ID  - ofr95493
ER  -