TY  - RPRT
TI  - 40Ar/39Ar dates for the Spanish Peaks intrusions in south-central Colorado
AU  - B.S. Penn
AU  - David A. Lindsey
PY  - 2009
DO  - 10.2113/gsrocky.44.1.17
UR  - https://pubs.usgs.gov/publication/70208501
ID  - 70208501
ER  -