Environmental Protection

El Morro Trails: El Morro National Monument, New Mexico

Rewilding Your Life

The Geology of Button Bay State Park

The Lobster Fishery of Maine

Our Allies The Microbes

Grand Teton: A Guide to Grand Teton National Park, Wyoming

Green Living Gratitude

Little Frog Wonders

A Guide to Natural Bridges National Monument, Utah

Big Bend National Park, Texas

Birds in Town & Village

Canadian Wilds

The Wonders of the Jungle, Book Two

Dickey Downy: The Autobiography of a Bird

The Face of the Earth as Seen from the Air

The Wonders of the Jungle, Book One

The Way of the Wild

Conservation of marine birds of northern North America: papers from the international symposium held at the Seattle Hyatt House

The Story of a Red Deer

Our Vanishing Wild Life: Its Extermination and Preservation