Butterflies of Ellis County, Texas - Information about and pictures of all the known species of butterflies in the county. - http://www.butterfliesandmoths.org/map?dc=5607&_dcc=1&si=44
Ellis County Report: Pollution Locator - Map of the polluting sources, air quality ranking, and other pertinent environmental data for Ellis County, TX. - http://www.scorecard.org/env-releases/cap/county.tcl?fips_county_code=48139#maps
Ellis County Watershed Template - From the Environmental Protection Agency; explores America's water resources with an emphasis on the quality of our Nation's water and features powerful searching, mapping, database querying, and informative hot links. - http://cfpub.epa.gov/surf/county.cfm?fips_code=48139
Amphibians and Reptiles in Ellis County - Texas Cooperative Wildlife Collection list of species found in the county. - http://wfscnet.tamu.edu/tcwc/checklist/ELLIS070.HTM