Hill Country Underground Water Conservation District
- District addresses parts of Edwards, Hensell, Ellenburger, and Hickory aquifers in the county. Site gives map, information on existing and abandoned wells, and water data, with district board members and meetings.
- http://www.hcuwcd.org/

Amphibians and Reptiles in Gillespie County
- Texas Cooperative Wildlife Collection list of species found in the county.
- http://wfscnet.tamu.edu/tcwc/checklist/GILLE086.HTM