Folder: S.F. Bridges-Bay-Construction-Yerba Buena Island.
Printed on back: "Aerial view of traveler derrick erecting Span E-9 (lower left) which is the last of the 288-foot spans according chief Engineer C.H. Purcell. Also, erection of Span YB-1 on Yerba Buena Island in progress. The entire West Bay Crossing, with Tower 5 under construction, may be seen in the background.".