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学科
- Trees3
- Clouds2
- Shrubs2
- Yellowstone national park2
- Fences1
- Fountain paint pots (yellowstone national park)1
- Hills1
- Index peak (wyo.)1
- Lower geyser basin (wyo.)1
- Mineral deposits1
- Minerals1
- Mountains1
- Mud1
- National parks & reserves1
- Norris geyser basin (wyo.)1
- Pilot peak (wyo.)1
- Red lodge (mont.)1
- Signs (notices)1
- Springs1
- Streams1