TY  - RPRT
TI  - The southeastern Illinois earthquake of 10 June 1987: The later aftershocks
AU  - C.J. Langer
AU  - G. A. Bollinger
PY  - 1991
DO  - 10.1785/bssa0810020423
UR  - https://pubs.usgs.gov/publication/70016626
ID  - 70016626
ER  -