Environmental Protection

At the Sign of the Fox

Letters to a Friend, Written to Mrs. Ezra S. Carr, 1866–1879

The Spell of the Rockies

Nature Mind Healing

Pearls and Pebbles; or, Notes of an Old Naturalist

Seed Bank Vaults

In Beaver World

My First Summer in the Sierra (With Original Drawings & Photographs)

The Rocky Mountain Wonderland

A Pictorial Guide to Mesa Verde National Park

The Arctic Prairies : a Canoe-Journey of 2,000 Miles in Search of the Caribou

The Wilderness Castaways

Jane Goodall: 50 Years at Gombe

A Rough Ride to the Future

Predators or Protectors

Forest Canopy Webs

Coral Reef Networks

Sustainable Living

Rare Desert Flora

Forest Mysteries