TY - RPRT TI - Field instrumentation studies of earth tremors and their geologic environments in central Utah coal mining areas AU - Frank W. Osterwald AU - J.B. Bennetti AU - C.R. Dunrud AU - J. O. Maberry PY - 1971 DO - 10.3133/pp693 UR - https://pubs.usgs.gov/publication/pp693 ID - pp693 ER -