Environmental Protection

Forest, Lake and Prairie

Wild Earth

The book of earth

The Migration of North American Birds

Krag and Johnny Bear

Underground Treasures: How and Where to Find Them

The Encantadas

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

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

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)