TY - RPRT TI - In-situ measurements of seismic velocities at twelve locations in the San Francisco Bay region AU - J. F. Gibbs AU - T. E. Fumal AU - R. D. Borcherdt PY - 1975 DO - 10.3133/ofr75564 UR - https://pubs.usgs.gov/publication/ofr75564 ID - ofr75564 ER -