I am looking for a book or digital database of rock climbing pictures from before 1950.
I tried to search online, but, except for a few pictures, I didn't have much luck. Also, the name of the photographer and/or the source are often not reported in the pictures that I found online.
The period I am more interested in is the 1920s-40s, the "golden age" of rock climbing in Europe. To be even more specific, I would be very happy to find some photography book/database about climbing in the Alps in the 1920s-40s.