Barton Springs & Edwards Aquifer
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Barton Springs
Edwards Aquifer
Edwards Aquifer Springs
Endangered species
References
Author. Year. Title.
http://www.youtube.com/watch?v=TaVitNvRYkA
http://www.edwardsaquifer.net/
http://www.ci.austin.tx.us/parks/bartonsprings.htm
http://www.garot.com/fun/austin/2005/Oct_Whirlpool/