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)
50 Hikes in Central Florida (Third Edition) (Explorer's 50 Hikes)
Five-Star Trails: Gainesville & Ocala
Explorer's Guide North Florida & the Panhandle (Third Edition) (Explorer's Complete)
Five-Star Trails: Orlando