Amphibians and Reptiles in Castro County - Texas Cooperative Wildlife Collection list of species found in the county. wfscnet.tamu.edu/tcwc/checklist/CASTR035.HTM
Butterflies of Castro 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_69.htm
Capitol Impact: Castro County - Political, economic, and educational data. www.capitolimpact.com/gw/txcty/tx48069.html
Castro 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=48069
Handbook of Texas Online : Castro County - Current and historical information about Castro County. www.tsha.utexas.edu/handbook/online/articles/view/CC/hcc8.html
