Revision History for USGS Open-File Report 76-731 James F. Gibbs, Thomas E. Fumal, and Roger D. Borcherdt In-Situ Measurements of Seismic Velocities in the San Francisco Bay Region...Part II ----------------------------------------------------- Posted online at http://pubs.usgs.gov/of/1976/0731/ December 6, 2011 Initial release in paper form 1976 -----------------------------------------------------