In fact, there weren't any until the forties. In most issues, there are jokes at the expense of co-eds. There are a good number of Scotch-Irish jokes too, usually pertaining to their stinginess. The jokes were more revealing in other ways as well. For instance, they had jokes about Prohibition and the Women's Christian Temperance Union.
Puns also seem to have been to be pretty popular.
I alternated between giggling and rolling my eyes as I flipped through the old copies. However, many of the jokes still fit college life today. Frats, for example, had about the same reputation. If you send any of my answers to the funny papers, I expect you to split 50-50 with me.