Ecology

A Book of Dartmoor

The Tropical World

Proceedings of the fourth National Conservation Congress at Indianapolis, October 1–4, 1912

The Andes and the Amazon; Or, Across the Continent of South America

Street Trees

The Twelve Months of the Year, with a Picture for each Month

Pere Marquette State Park

The Young Collector's Handbook of Ants, Bees, Dragon-flies, Earwigs, Crickets, and Flies

Speciation of the Wandering Shrew

Carlsbad Caverns National Park, New Mexico

The Land of Enchantment: From Pike's Peak to the Pacific

Shaggycoat

The Underworld of Oregon Caves National Monument

Island Trail at Walnut Canyon. Walnut Canyon National Monument

The Nakimu Caves, Glacier Dominion Park

Perambulations of a Bee and a Butterfly

A Guide to Natural Bridges National Monument, Utah