I found an online archive of digitized Valpo yearbooks from 1896-2005. Didn't see it posted anywhere else on the forum after a quick search, so I thought I'd share.
The university has a 10-year embargo on posting new yearbooks for privacy reasons. Nevertheless, it's a great resource. A little clunky to use, but it's all there: http://library.valpo.edu/archives/yearbooks/index.html (http://library.valpo.edu/archives/yearbooks/index.html)