TY  - RPRT
TI  - Preliminary determination of epicenters monthly listing, April-June 1990
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1990
DO  - 10.3133/ofr90600b
UR  - https://pubs.usgs.gov/publication/ofr90600B
ID  - ofr90600B
ER  -