TY  - RPRT
TI  - Geologic map of Mount St. Helens, Washington prior to the 1980 eruption
AU  - Clifford A. Hopson
PY  - 2008
DO  - 10.3133/ofr2002468
UR  - https://pubs.usgs.gov/publication/ofr2002468
ID  - ofr2002468
ER  -