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Hypogene Karst Regions and Caves of the World; Cave and Karst Systems of the World ,
6
The Frasassi Caves: A "Classical" Active Hypogenic Cave:
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Hypogene Karst Regions and Caves of the World; Cave and Karst Systems of the World ,
7
Hypogenic Caves in the Apennine Mountains (Italy):
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Hypogene Karst Regions and Caves of the World; Cave and Karst Systems of the World ,
8