Title
General distribution of geologic materials in the San Francisco Bay Region, California, a digital map database [electronic resource] : based on the work of E.E. Brabb (1980), S.E. Ellen and C.M. Wentworth (1995), and E.J. Helley and K.R. Lajoie (1979) / digitally compiled by Carl M. Wentworth.
Published
[Menlo Park, Calif.] : U.S. Dept. of the Interior, U.S. Geological Survey, 1997.