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学科
- Automobiles3
- Boats1
- Canyons6
- Cliffs11
- Clouds13
- Coastlines3
- Flowers2
- Forests16
- Geysers4
- Grasses1
- Hills2
- Lakes & ponds7
- Men1
- Mineral deposits3
- Minerals3
- Mountains22
- National parks & reserves[remove]31
- Passes (landforms)2
- People2
- Railings1