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Subject
- Caves148
- Antiquities19
- Paleontology12
- Description and travel11
- Geology10
- Karst8
- Cavernes6
- Speleology6
- Cave animals5
- Law and legislation5
- National Cave and Karst Research Institute (U.S.)5
- Temples5
- Mines and mineral resources4
- Prehistoric peoples4
- Geophysical research3
- Glaciers3
- Historic sites3
- Paleolithic period3
- Research3
- Archaeology2