Though not required of public domain images, if you want to credit the library as the source, please use the following statement: "From the San Francisco History Center, San Francisco Public Library" and provide a link back to the item on our Digital Collections site.
Folder: S.F. Fort Mason. On back: "A civilian worker moves the cargo; a civilian patrolman guards it. Two phases of civilian employment at the Fort Mason battle station are shown in the photograph above. Fort Mason, San Francisco Port of Embarkation installation, is one of the 160 Army and Navy battle stations recruiting civilian workers to speed victory in the Pacific.".