TY - RPRT TI - Oligocene basaltic volcanism of the northern Rio Grande Rift: San Luis Hills, Colorado AU - R. A. Thompson AU - C.M. Johnson AU - H. H. Mehnert PY - 2012 DO - 10.1029/91jb00068 UR - https://pubs.usgs.gov/publication/70016412 ID - 70016412 ER -