Scats and Tracks of the Rocky Mountains: A Field Guide to the Signs of 70 Wildlife Species (Scats and Tracks Series) Paperback – September 15, 2015

Scats and Tracks of the Rocky Mountains: A Field Guide to the Signs of 70 Wildlife Species (Scats and Tracks Series)

Animal Tracks: A Folding Pocket Guide to the Tracks & Signs of Familiar North American Species (Nature Observation North America)

Colorado Nature Set: Field Guides to Wildlife, Birds, Trees & Wildflowers of Colorado (Nature Observation North America)