Just realized the dates are in the titles 
Folsom and Army Streets, May 29, 1942 by San Francisco Public Library, on Flickr
Potrero and 24th Streets, Ford ambulance and Ford sedan, January 7, 1943 by San Francisco Public Library, on Flickr
501 Dolores Street at 18th Street, circa 1952. by San Francisco Public Library, on Flickr


