Reptiles and amphibians of Zion National Park

Naturalists Mexico

Ruins to Ruins: From the Mayan Jungle to the Aztec Metropolis

Native Host Plants for Texas Butterflies: A Field Guide

Butterflies of the Lower Rio Grande Valley

Naturalist's Big Bend: An Introduction to the Trees and Shrubs, Wildflowers, Cacti, Mammals, Birds, Reptiles and Amphibians

The American Robin

A Birder's West Indies: An Island-By-Island Tour

Borderland Birds: Nesting Birds of the Southern Border

Raptors: Hawks, Eagles, Kites Falcons, and Owls