Nature

Wilderness Babies

Freckles from the Marvelous Forest

Fishes of Chautauqua, Cowley and Elk Counties, Kansas

The Hurricane Guide

Mammals of Northwestern South Dakota

Wild Spain (España agreste)

Michigan Trees: A Handbook of the Native and Most Important Introduced Species

Birds of Britain

Grand Teton: A Guide to Grand Teton National Park, Wyoming

A Book of Dartmoor

How now

Earth Features and Their Meaning An Introduction to Geology for the Student and the General Reader

KAZAN (Including the Sequel – Baree, Son Of Kazan)

Snakes

Ocean Gardens

The Geologic Story of Colorado National Monument

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

A voyage to Spitzbergen

Mammals of the Southwest Mountains and Mesas

Buster Bear's Twins