TY - RPRT TI - Digital data for volcano hazards of the Three Sisters region, Oregon AU - S. P. Schilling AU - S. Doelger AU - W. E. Scott AU - R.M. Iverson PY - 2008 DO - 10.3133/ofr20071221 UR - https://pubs.usgs.gov/publication/ofr20071221 ID - ofr20071221 ER -