Amateur color photographer Charles Cushman’s archive is now on-line thanks to Indiana University. You can visit the home page and read more about it at:

http://webapp1.dlib.indiana.edu/cushman/

This collection is especially strong in the western states with 4,723 color views of California. Here’s a sample of the building of the second Carquinez bridge in 1957:

http://xrl.us/6xdy