Folder: S.F. Parks-Golden Gate-Sewage Treatment Plant.
On back: "Photographed by City and County of San Francisco, Department of Public Works, Bureau of Engineering. NO.___; PHOTOGRAPHED: 1974; PHOTOGRAPHER: Police Helicopter Unit; ACCOMPANIED BY: Ray Skow, pilot; DIVISION: GES; SECTION: Structural; JOB TITLE:___; DESCRIPTION: Sewage Treatment Plant, Golden Gate Park. Return to Joe Adams."