Trees & Shrubs of the Trans-Pecos and Adjacent Areas
By A. Michael Powell
http://www.utexas.edu/utpress/books/powtre.html

Birds of the Trans-Pecos
By Jim Peterson and Barry R. Zimmer
http://www.utexas.edu/utpress/books/petbir.html

The Mammals of Trans-Pecos Texas
Including Big Bend National Park and Guadalupe Mountains National Park
By David J. Schmidly
http://www.tamu.edu/upress/BOOKS/LITE/SCHMIDLY.HTM

The Ecology of Desert Communities
By Gary Polis (editor)
http://www.uapress.arizona.edu/BOOKS/bid358.htm