My site, SFMemory, currently has over 9000 Historical images of San Francisco, the East Bay, and Northern California. I've done a lot, but I can always use help. Currently 245 images have the words "Unknown Location" I couldn't find them but maybe you can! #sfhistoryhttps://sfmemory.org/search/index.php?q="unknown+location"&_ds=1&bn=0&bs=250&so0=contains&so1=contains&sk=5&desc=0