TY  - RPRT
TI  - Preliminary geologic map of the Bull Fork quadrangle, Garfield and Rio Blanco counties, Colorado
AU  - W. J. Hail
PY  - 1977
DO  - 10.3133/mf830
UR  - https://pubs.usgs.gov/publication/mf830
ID  - mf830
ER  -