Environmental Protection

Birds of Britain

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

A Thousand-Mile Walk to the Gulf (With Original Drawings & Photographs)

A voyage to Spitzbergen

Buster Bear's Twins

The Geology of Button Bay State Park

Poisonous Snakes of Kansas

Everglades Wildguide

The Incredible Travel Tales of John Muir (Illustrated Edition)

Shoshone National Forest, Wyoming

Cactus Forest Drive, Saguaro National Monument

The English Lakes

Whale Primer, with Special Attention to the California Gray Whale

The Secret Places Of The Shannon

Where Men No More May Reap or Sow

Earth Science and Earth Structure

Nature's Teachings: Human Invention Anticipated by Nature

Tree Magic

Gifts of an Eagle

Our Wild World