Environmental Protection

Nature's invitation: Notes of a bird-gazer, North and South

Our Arctic province : Alaska and the Seal Islands

The turtles, snakes, frogs and other reptiles and amphibians of New England and the north

Colin Clout's Calendar: The Record of a Summer, April-October

By the Marshes of Minas

A Short Account of the Botany of Poole

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

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

Masters of the Wilderness

The Stewardship of the Soil

Tales of a Vanishing River

At the Sign of the Fox

Wood Wanderings

Letters from Australia

The Encantadas

3000 Miles in the Great Smokies

Tinicum & Eastwick

Literary Pilgrimages of a Naturalist

The Grail Bird

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