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Amphibians and Reptiles in Callahan County - Texas Cooperative Wildlife Collection list of species found in the county.
The Political Graveyard: Callahan County - Lists politicians who lived or died in the county.
Handbook of Texas Online : Callahan County - Current and historical information about Callahan County.
Butterflies of Callahan County, Texas - Information about and pictures of all the known species of butterflies in the county.
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