Ecosystems & Habitats

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

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

The Seashore Book: Bob and Betty's Summer with Captain Hawes

Carlsbad Caverns National Park, New Mexico

The Trail of the Elk

Grit A-Plenty: A Tale of the Labrador Wild

The Outdoor Chums in the Big Woods; Or, Rival Hunters of Lumber Run

The Nakimu Caves, Glacier Dominion Park

Lassen Trails: A Brief Guide to the Trails of Lassen Volcanic National Park

Cactus Forest Drive, Saguaro National Monument

The Geologic Story of Colorado National Monument

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

Grand Teton: A Guide to Grand Teton National Park, Wyoming

Ferns of Hawaii National Park

Cruise of the 'Alert

The Ring of Bright Water Trilogy

Endangered and Disappearing Birds of the Midwest

Tenting To-night

Music of the Wild

Glimpses of Ocean Life; Or, Rock-Pools and the Lessons they Teach