TY  - RPRT
TI  - Tertiary volcanic stratigraphy in the Powderhorn-Black Canyon region, Gunnison and Montrose Counties, Colorado
AU  - Jerry Chipman Olson
AU  - David Carl Hedlund
AU  - Wallace R. Hansen
PY  - 1968
DO  - 10.3133/b1251c
UR  - https://pubs.usgs.gov/publication/b1251C
ID  - b1251C
ER  -