Ecology

The Underworld of Oregon Caves National Monument

Island Trail at Walnut Canyon. Walnut Canyon National Monument

A Synopsis of the British Mosses

Woodland Paths

Forest Friends

A Guide to Natural Bridges National Monument, Utah

Perambulations of a Bee and a Butterfly

Big Bend National Park, Texas

Among the Pond People

Among the Meadow People

The Face of the Earth as Seen from the Air

Margaret Mahaney Talks About Turkeys

Young Folks' Nature Field Book

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

Canoe and camera: a two hundred mile tour through the Maine forests

Karaway the Cockatoo and Other Nature Stories

The Tropical World

Street Trees

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

Afloat in the Forest; Or, A Voyage among the Tree-Tops