TY  - RPRT
TI  - Preliminary geologic map of the Gray Head quadrangle, San Miguel County, Colorado
AU  - A.L. Bush
AU  - C. S. Bromfield
AU  - O.T. Marsh
AU  - R.B. Taylor
PY  - 1961
DO  - 10.3133/mf176
UR  - https://pubs.usgs.gov/publication/mf176
ID  - mf176
ER  -