Most of the photos on this site were extracted from reference images (high-resolution tiffs, 20 to 200 megabytes in size) from the Library of Congress research archive. (To query the database click here.) Many were digitized by LOC contractors using a Sinar studio back. They are adjusted by your webmaster for contrast and color in Photoshop before being downsized and turned into the jpegs you see here.
This is one of many color slides that my father shot when we lived in the San Francisco area in the mid to late 1950's. This particular shot was taken on Anscochrome film and shows Union Square in downtown SF. Note the overhead wires for the electric buses. I have many more like this, which I'll try to post as time allows. View full size.