Sinkholes appear where rock dissolves underground allowing the ground over it to collapse. An in-depth geological investigation.
Explorer's Guide South Florida: Includes Sarasota, Naples, Miami & the Florida Keys (Second Edition) (Explorer's Complete)
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Explorer's Guide North Florida & the Panhandle (Third Edition) (Explorer's Complete)
Five-Star Trails: Gainesville & Ocala
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Explorer's Guide 50 Hikes in Central Florida (Second Edition) (Explorer's 50 Hikes)