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学科
- National parks & reserves[remove]29
- Trees[remove]29
- Mountains19
- Forests15
- Shrubs12
- Cliffs10
- Clouds10
- Roads10
- Canyons6
- Lakes & ponds6
- Shadows6
- Springs6
- Rocks5
- Fences4
- Fountain paint pots (yellowstone national park)4
- Lower geyser basin (wyo.)4
- Mineral deposits4
- Minerals4
- Mud4
- Tree limbs4