Nature

The Underworld of Oregon Caves National Monument

The Common Rocks and Minerals of Missouri

Ferns of Hawaii National Park

Take a Can of Salmon

Toadstools, mushrooms, fungi, edible and poisonous; one thousand American fungi

The Nakimu Caves, Glacier Dominion Park

Snakes

The Geologic Story of Colorado National Monument

The Botanical Lore of the California Indians with Side Lights on Historical Incidents in California

Poisonous Snakes of Texas and First Aid Treatment of Their Bites

Texas Rocks and Minerals: An Amateur's Guide

Forest Trees of Texas: How to Know Them

The Geologic Story of Palo Duro Canyon

Creation of the Teton Landscape: The Geologic Story of Grand Teton National Park

A Journey in Brazil

Lassen Trails: A Brief Guide to the Trails of Lassen Volcanic National Park

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

The Geology of Button Bay State Park

The Lobster Fishery of Maine

A Manual of Bird Study. A Description of Twenty-Five Local Birds with Study Options