Colorado Birds: A Folding Pocket Guide to Familiar Species (Nature Observation North America)

Colorado Trees & Wildflowers: A Folding Pocket Guide to Familiar Plants (Wildlife and Nature Identification)

Colorado Wildlife: A Folding Pocket Guide to Familiar Animals (Wildlife and Nature Identification)

Birds of Colorado Field Guide

American Birding Association Field Guide to the Birds of Colorado (American Birding Association State Field)

Animal Tracks: A Folding Pocket Guide to the Tracks & Signs of Familiar North American Species (Wildlife and Nature Identification)

Colorado Butterflies & Moths: A Folding Pocket Guide to Familiar Species (Wildlife and Nature Identification)

Wildflowers of Colorado Field Guide (Wildflower Identification Guides)

Colorado Nature Set: Field Guides to Wildlife, Birds, Trees & Wildflowers of Colorado