Ecology

Food Habits of the Thrushes of the United States

Earthworms and Their Allies

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

Fishes of Chautauqua, Cowley and Elk Counties, Kansas

Notes of a naturalist in South America

Forest Trees of Illinois: How to Know Them

Trees: A Woodland Notebook

Love's Meinie: Three Lectures on Greek and English Birds

The Structure and Habits of Spiders

More Hunting Wasps

The Legend of Kupirri, or, The Red Kangaroo

Running Free

Adventures of a Young Naturalist

Wilderness Babies

Ecological Observations on the Woodrat, Neotoma floridana

Craters of the Moon

A Thousand-Mile Walk to the Gulf (With Original Drawings & Photographs)

Wake-Robin

Essays of a Biologist

Canyons of the Colorado