TY  - RPRT
TI  - Preliminary geologic map of the Figure Four Spring quadrangle, Rio Blanco and Garfield Counties, Colorado
AU  - R. C. Johnson
PY  - 1977
DO  - 10.3133/mf912
UR  - https://pubs.usgs.gov/publication/mf912
ID  - mf912
ER  -