Biography
McCarthy Colin,
Reptile
. Helen Parker, United States: Dorling Kindersly, 2000.
http://www.lib.utexas.edu/maps/world_maps/world_pol02.jpg
http://www.dnr.state.oh.us/wildlife/resources/wildnotes/pub373.htm
http://www.herpnet.net/Iowa-Herpetology/reptiles/snakes/copperhead.html
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