I don't believe Wikipedia. The fourth IETF proceedings lists 90 .edu domains registered as of July 10, 1986.

Of those, 18 are still currently registered but are not in Wikipedia's list: buffalo.edu colgate.edu du.edu houston.edu lehigh.edu merit.edu mosis.edu riacs.edu sdsu.edu sunysb.edu tmc.edu ucar.edu uchicago.edu uiowa.edu umb.edu uoregon.edu villanova.edu vt.edu

A further 7 are no longer registered: mich-state.edu ntsu.edu ogc.edu pittsburgh.edu ukans.edu wanginst.edu waterloo.edu