TY  - RPRT
TI  - Variation of P-wave velocity before the Bear Valley, California, earthquake of 24 February 1972
AU  - R. Robinson
AU  - R. L. Wesson
AU  - W.L. Ellsworth
PY  - 1974
DO  - 10.1126/science.184.4143.1281
UR  - https://pubs.usgs.gov/publication/70011057
ID  - 70011057
ER  -