Rocks & Minerals

The Ornithosauria

Biology, The Myth Of Evolution

Canyons of the Colorado

Across Mongolian Plains

Beach Rambles in Search of Seaside Pebbles and Crystals

Earth Features and Their Meaning An Introduction to Geology for the Student and the General Reader

The Geologic Story of Colorado National Monument

British Museum (Natural History) General Guide

The Geology of Button Bay State Park

The Geology of D.A.R. State Park, Mt. Philo State Forest Park, Sand Bar State Park

The Geologic Story of Glacier National Park

Texas Rocks and Minerals: An Amateur's Guide

The Glaciers of the Alps

Cave Regions of the Ozarks and Black Hills

Pleistocene Bats from San Josecito Cave, Nuevo Leon, Mexico

Pleistocene Bats from San Josecito Cave, Nuevo Leon, Mexico

Underground Treasures: How and Where to Find Them

Fragments of Earth Lore: Sketches & Addresses Geological and Geographical

Mount Rainier, a Record of Exploration

Florida Caverns State Park