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学科
- National parks & reserves[remove]35
- Trees29
- Mountains22
- Forests16
- Clouds13
- Shrubs12
- Cliffs11
- Roads10
- Springs9
- Lakes & ponds7
- Mineral deposits7
- Minerals7
- Valleys7
- Canyons6
- Shadows6
- Rocks5
- Tree limbs5
- Fences4
- Fountain paint pots (yellowstone national park)4
- Geysers4