Shorpy.com is an amazing source of high-resolution photos of the past. I’ve selected a few here but there are hundreds more on the site.
San Francisco – June 1 1935 – Blaisdell 15935 – 8×10 filmneg – eb 2015 – Union Square and Geary Street – Owl Drug – Sunkist billboard
San Francisco circa 1927. “Cadillac and swimmers at Fleishhacker Pool.” 5×7 glass negative formerly of the Wyland Stanley collection.
San Francisco circa 1925. “Auto at Twin Peaks — North Peak seen from South Peak.” 5×7 glass negative from the Wyland Stanley collection.
San Francisco circa 1927. “Cadillac and swimmers at Fleishhacker Pool.” 5×7 glass negative formerly of the Wyland Stanley collection.
San Francisco circa 1927. “Cadillac touring car with Fleishhacker Swimming Club.” With someone who’s either their coach or their mechanic. 5×7 glass negative, formerly of the Wyland Stanley and Marilyn Blaisdell collections
Stannous Flouride's Book of Truthiness 