Amphibians and Reptiles in Marion County - Texas Cooperative Wildlife Collection list of species found in the county. wfscnet.tamu.edu/tcwc/checklist/MARIO155.HTM
Butterflies of Marion 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_315.htm
Handbook of Texas Online - Current and historical information about Marion County. www.tsha.utexas.edu/handbook/online/articles/view/MM/hcm2.html
Marion 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=48315
