caldecott tunnel

photograph 1934 From "Hamilton, William J. Alameda County Supervisor Died 11-6-38" folder. From back of photograph: "Wm. J. Hamilton - Thomas E. Caldecott at tunnel ground breaking." Two well dressed men...	photograph unknown Written on the back: slide on freeway east of Caldecott tunnel
photoprint postcard Davies \| Alamo ca. 1930s Photograph, postcard backing, "Entrance to the Broadway Tunnel. Connects San Francisco and East Bay with Contra Costa county. Twin Bores nearly 3/4 mile long. Davies Photo Service, Alamo Cal...	Construction of Highway 24 to Walnut Creek (Caldecott Tunnel) John Charles Haley 1940