This is a compilation of geological field guides prepared by undergraduates for the Ohio Intercollegiate Field Trips held annually since 1951. A total of eleven colleges have contributed, some contributing more than one guide, resulting in guides to eighteen different trips. Guides include trip logs, maps and sections, notes on formations, illustrations of fossils, notes on geological history, and lists of references. A generalized column of rocks in Ohio, a geologic map of Ohio, and a general bibliography are included. (EB)