TY  - RPRT
TI  - Frequency of earthquakes for selected areas in the western United States for the period 1945-59
AU  - W.S. Twenhofel
AU  - R.A. Black
AU  - D.F. Balsinger
PY  - 1961
DO  - 10.3133/tei782
UR  - https://pubs.usgs.gov/publication/tei782
ID  - tei782
ER  -