Colorado Butterflies & Moths: A Folding Pocket Guide to Familiar Species (A Pocket Naturalist Guide)

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

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

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

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

Wildflowers of Colorado Field Guide (Wildflower Identification Guides)

The National Audubon Society Field Guide to North American Butterflies

Trees of Colorado Field Guide (Tree Identification Guides)

Montana Butterflies & Moths: An Introduction to Familiar Species (Wildlife and Nature Identification)