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- Caves 88
- Speleothems 15
- Formations (Geology) 14
- Portraits, Group 9
- Beaches 8
- Coasts--Oregon 8
- Oregon Caves National Monument (Or.) 8
- Landforms 7
- Men 7
- Ice caves 6
- Pacific Coast (Or.) 6
- Art and photography 5
- Art, Modern 5
- Finley, Irene 5
- Finley, Phoebe Katherine 5
- Finley, William L., Jr. 5
- Photography 5
- art photography 5
- black-and-white photography 5
- gelatin silver prints 5
