Thomas F. Hess was a professor emeritus at the University of Idaho Department of Biological and Agricultural Engineering. The materials in this collection include Hess' own course work while attending the University of Colorado in the late 1970s to early 1980s. It also contains research materials about wastewaster supply and sanitation, and other research relating to biological and argicutlural engineering. Additionally, there are some teaching materials from his time teaching at the Unviersity of Idaho and Washington State Unviersity.