All the birds of Texas and most of those found in New Mexico, Oklahoma, Arkansas, and Louisiana are illustrated here in 60 plates that show key features. Descriptions of 542 species, silhouttes, and comparisons of similar species help with accurate identification.
Roger Tory Peterson was an American naturalist, ornithologist, artist, and educator, and held to be one of the founding inspirations for the 20th century environmental movement.
A very helpful guidebook to Texas birds - the silhouttes and bird calls are helpful in identifying birds on hikes. I have a first edition of this book, and found the section on rare sightings (or accidentals) fascinating to read.