Butterflies of North America
Jim P. Brock & Kenn Kaufman
2003, Houghton Mifflin [Very user friendly field guide]
Butterflies of the Lower Rio Grande Valley
Roland H. Wauer, 2004 Johnson Books
$25.00 (Good discussion and okay photos, a very useful field guide)
Butterflies through Binoculars, The East
Jeffrey Glassberg
1999, Oxford, $19.95 [Good photographic field guide]
Butterflies through Binoculars, The West
Jeffrey Glassberg
2001, Oxford, $19.95 [Good photographic field guide]
Field Guide to Butterflies
Robert Michael Pyle
1998, National Audubon Society, Knopf [Good field guide but has no range maps]
Butterflies of Houston & Southeast Texas
John & Gloria Tveten
1996, University of Texas Press, $19.95 [An excellent readable species account]
The Butterflies of South Texas
David Hansen
CD, $17.95 [Good photos taken locally by the author in the lower Rio Grande Valley]