Nature

The Geologic Story of Colorado National Monument

The Geology of Button Bay State Park

Quirky Giraffe Spots

Alpaca Fuzz Secrets

Gatlinburg and the Great Smokies

The Common Rocks and Minerals of Missouri

Herbivore vs Carnivore

Urban Plant Life

A Guide to Natural Bridges National Monument, Utah

Deep Cave Missions

Arctic Ice Treks

Bird Guide: Land Birds East of the Rockies, from Parrots to Bluebirds

World Oceans

The Moths of the British Isles, First Series Comprising the Families Sphingidæ to Noctuidæ

Wild Birds in City Parks

Green Living on a Budget

Wild Animals of the Rockies. With a List of Mammals found in Rocky Mountain National Park

Whale Primer, with Special Attention to the California Gray Whale

Ant Life

Rewilding Your Life