Does the library have a copy of the University catalog for previous years?
Got to http://www.csuchico.edu/catalog/library.html to access the University Catalog Library. The site has PDF copies of catalogs from 1995-97 through 2012-13. Course descriptions can be requested from catalogs published before 1993.
You can also make copies from print editions of old catalogs in our Special Collections department on the 3rd floor of the library. Their hours are listed here http://www.csuchico.edu/library/libhours.html.