TY  - RPRT
TI  - High-resolution 40Ar 39Ar chronology of Oligocene volcanic rocks, San Juan Mountains, Colorado
AU  - M. A. Lanphere
PY  - 1988
DO  - 10.1016/0016-7037(88)90212-8
UR  - https://pubs.usgs.gov/publication/70013770
ID  - 70013770
ER  -