Introduction to Geology  by Chris Johnson, Matthew D. Affolter, Paul Inkenbrandt, and Cam Mosher, Salt Lake Community College

Historical Geology by Callan Bentley, Karen Layou, Russ Kohrs, Shelley Jaye, Matthew D. Affolter, and Brian Ricketts (in progress)

Introduction to Mineralogy by Dexter Perkins, University of North Dakota

Introduction to Petrology by Dexter Perkins, University of North Dakota