Monmouth College is a well known college for those of us in the NPC as it was the founding place for both Pi Beta Phi and Kappa Kappa Gamma.
In 2011, they digitalized their yearbooks. They have yearbooks from 1892-2002 online at
this website. I have had a lot of fun looking through the pages. The search doesn't always work so if there is a key word you are looking for that doesn't turn up, try looking at the index.
Organizations that I have seen: Alpha Tau Omega, Alpha Xi Delta, Kappa Delta, Kappa Kappa Gamma, Pi Beta Phi, Sigma Phi Epsilon, Tau Kappa Epsilon, Theta Chi, and Phi Alpha Sigma. There may be more though.