Amphibians and Reptiles in Zavala County - Texas Cooperative Wildlife Collection list of species found in the county. wfscnet.tamu.edu/tcwc/checklist/ZAVAL254.HTM
Butterflies of Zavala County, Texas - Information about and pictures of all the known species of butterflies in the county. www.npwrc.usgs.gov/resource/DISTR/LEPID/BFLYUSA/chklist/states/counties/tx_507.htm
Handbook of Texas Online - Current and historical information about Zavala County. www.tsha.utexas.edu/handbook/online/articles/view/ZZ/hcz2.html
Zavala County QuickFacts from the US Census Bureau - Population, demographic, and housing information from the 1990 census. Link to Tiger map of the county. quickfacts.census.gov/cgi-bin/county?cnty=48507
Zavala County Texas - Zavala County departments, agencies and related links. proagency.tripod.com/zavalacounty.html
