Roadside Geology of Yellowstone Country
Roadside Geology of Montana (Roadside Geology Series)
Roadside Geology of Colorado
Roadside Geology of South Dakota
Roadside Geology of Utah
Roadside Geology of Idaho (Roadside Geology Series)
Roadside Geology of Nevada (Roadside Geology Series)
Rockhounding Wyoming: A Guide to the State's Best Rockhounding Sites
Roadside Geology of Washington
Roadside Geology of Oregon