TY - RPRT TI - A field-trip guide to Yellowstone National Park, Wyoming, Montana, and Idaho: Volcanic, hydrothermal, and glacial activity in the region AU - Robert O. Fournier AU - R.L. Christiansen AU - R. A. Hutchinson AU - K. L. Pierce PY - 1994 DO - 10.3133/b2099 UR - https://pubs.usgs.gov/publication/b2099 ID - b2099 ER -