TY - RPRT TI - Caldera-related lava flows and intrusions of the south-central San Juan Mountains, Colorado; analytical data AU - Douglas B. Yager AU - Peter W. Lipman AU - David A. Sawyer PY - 1991 DO - 10.3133/ofr91313b UR - https://pubs.usgs.gov/publication/ofr91313B ID - ofr91313B ER -