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- Caves 38
- Formations (Geology) 14
- Speleothems 14
- Oregon Caves National Monument (Or.) 11
- Lichens 7
- Landforms 6
- Caves--Oregon 4
- Ice caves 4
- Men 4
- Nature 4
- Resorts 4
- Trees 4
- Men's clothing 3
- National monuments 3
- Lodging-houses 2
- Rivers 2
- Stalactites and stalagmites 2
- Waterfalls 2
- Bonfires 1
- Bridges 1