Ecology

With the Harmony to Labrador

World's End

Wild Life at the Land's End

The Web of Life

An Account of the Insects Noxious to Agriculture and Plants in New Zealand

Earthworms and Their Allies

The Mountain that was 'God

The Book of the Fly

Wilderness Babies

Fishes of Chautauqua, Cowley and Elk Counties, Kansas

Mammals of Northwestern South Dakota

Canyons of the Colorado

Marine Protected Areas

In the Dwellings of the Wilderness

Nature Mysticism

Craters of the Moon

Wake-Robin

The Land's End: A Naturalist's Impressions In West Cornwall, Illustrated

The Eagle's Nest

Natural Treasures