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1966 Horizontal Strata. Big Clifty, KY. Physical Atlas Horizontal Strata. Big Clifty, KY. |
1966 Karst. Karst Topography. Mammoth Cave, K … Physical Atlas Karst. Karst Topography. Mammoth Cave, K … |
1966 Karst. Karst Topography. Coastal Plain. … Physical Atlas Karst. Karst Topography. Coastal Plain. … |