Ecosystems & Habitats

The Ocean World: Being a Description of the Sea and Its Living Inhabitants

The Flying Machine Boys in the Wilds The Mystery of the Andes

Then and Now or, Thirty-Six Years in the Rockies

The Story of the Hills: A Book About Mountains for General Readers

The Glaciers of the Alps

The Crest of the Continent: A Summer's Ramble in the Rocky Mountains and Beyond

The Guardians of the Columbia

Sketches in Duneland

An Essay on the Encroachments of the German Ocean Along the Norfolk Coast

Earth's Enigmas: A Volume of Stories

Crania Ægyptiaca

Creation of the Teton Landscape: The Geologic Story of Grand Teton National Park

Camping

The Story of a Thousand-Year Pine

The Nation's River: A report on the Potomac

Fragments of Earth Lore: Sketches & Addresses Geological and Geographical

Child's Book of Water Birds

The Yellowstone National Park: Historical and Descriptive

The Wolf Hunters: A Tale of Adventure in the Wilderness

Domesticated Animals