Roadside Geology of Florida
Roadside Geology of Missouri
Roadside Geology of Yellowstone Country
Glacial Lake Missoula: And Its Humongous Flood
Montana Before History: 11,000 Years of Hunter-Gatherers in the Rockies and Plains
Sagebrush Country: A Wildflower Sanctuary
Roadside Geology of Alaska: Second Edition
Roadside History of Arizona
