Environmental Protection

The White Heart of Mojave: An Adventure with the Outdoors of the Desert

Our Vanishing Wild Life: Its Extermination and Preservation

The House of the Trees & Other Poems

On Cambrian and Cumbrian Hills: Pilgrimages to Snowdon and Scafell

The Book of the Otter: A manual for sportsmen and naturalists

Under Blue Skies: Verses & Pictures

The Nation's River: A report on the Potomac

The Heart of the Wild: Nature Studies from Near and Far

Sanctuary: A Bird Masque

Woodland Gleanings: Being an Account of British Forest-Trees

My Year In A Log Cabin

The Grizzly, Our Greatest Wild Animal

Adventures of a Young Naturalist

The Development of the Feeling for Nature in the Middle Ages and Modern Times

My Year in a Log Cabin

Lightfoot the Deer

Getting Acquainted with the Trees

Our National Forests

Florida Caverns State Park

Wilderness Ways