Rocks & Minerals

The Geology of Button Bay State Park

The Geologic Story of Colorado National Monument

Fragments of Earth Lore: Sketches & Addresses Geological and Geographical

Underground Treasures: How and Where to Find Them

Pleistocene Bats from San Josecito Cave, Nuevo Leon, Mexico

Pleistocene Bats from San Josecito Cave, Nuevo Leon, Mexico

Canyons of the Colorado

Florida Caverns State Park

Underground Treasures: How and Where to Find Them

Fossil Forests of the Yellowstone National Park

Geology: The Science of the Earth's Crust

Across Mongolian Plains

Ancient Landscapes of the Grand Canyon Region

Gems in the Smithsonian Institution

Cave Regions of the Ozarks and Black Hills

Field Book of Common Rocks and Minerals

The Common Rocks and Minerals of Missouri

The Geologic Story of Palo Duro Canyon

North America

Rockhounding Bible