by D.A. Hubbard, Jr., folded 44 x 25-inch limited color 1:250,000-scale map and text, 1988. Sinkholes and cave entrances are plotted on a map of the Valley and Ridge province south of 38-degrees latitude and east of 81-degrees of longitude with karst areas subdivided into 6 carbonate units. Text describes karst development and karst hazards.
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