Ecology

Eco Sustainable Practices

Essays of a Biologist

Wake-Robin

The Eagle's Nest

Nature Mysticism

In the Dwellings of the Wilderness

Marine Protected Areas

Nature's Serial Story

The Isles of Sunset

The Myxomycetes of the Miami Valley, Ohio

Antarctic Penguins: A Study of Their Social Habits

The Common Objects of the Country

Grand Teton [Wyoming] National Park

The Life-Story of Insects

The Mammals of Warren Woods, Berrien County, Michigan

Woodland Tales

Coal, and What We Get from It

Wild Life Near Home

Mountaineering in the Sierra Nevada

With God in the Yellowstone