TY  - RPRT
TI  - Seismicity of the United States, 1568-1989 (revised)
AU  - C. W. Stover
AU  - J.L. Coffman
PY  - 1993
DO  - 10.3133/pp1527
UR  - https://pubs.usgs.gov/publication/pp1527
ID  - pp1527
ER  -