Environmental Protection

The Migration of North American Birds

Krag and Johnny Bear

Letters from Australia

Wood Wanderings

A Short Account of the Botany of Poole

Masters of the Wilderness

From North Pole to Equator: Studies of Wild Life and Scenes in Many Lands

The Stewardship of the Soil

Tales of a Vanishing River

At the Sign of the Fox

The Spell of the Rockies

Pearls and Pebbles; or, Notes of an Old Naturalist

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

Jane Goodall: 50 Years at Gombe

A Rough Ride to the Future

Thornton Burgess: Collected Works