TY  - RPRT
TI  - Digital geologic map of Yellowstone National Park, Idaho, Montana, and Wyoming and vicinity
AU  - Robert L. Christiansen
AU  - Ronald R. Wahl
PY  - 1999
DO  - 10.3133/ofr99174
UR  - https://pubs.usgs.gov/publication/ofr99174
ID  - ofr99174
ER  -