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- Mountains--Oregon 41
- Architecture, American 23
- Architecture--United States 23
- Mountaineering 18
- Sharp, Dallas Lore, 1870-1929 8
- Glaciers 7
- Forests and forestry 5
- Wild flowers 5
- Chipmunks 4
- Agriculture 3
- Fire lookout stations 3
- Rivers--Oregon 3
- Glacial crevasses 2
- Skis and skiing 2
- Automobiles 1
- Correspondence 1
- Dogs 1
- Harvesting 1
- James George Arbuthnot 1
- Lakes--Oregon 1