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Subject
- National parks & reserves[remove]176
- Rock formations106
- Cliffs85
- Canyons77
- Grand Canyon (Ariz.)69
- Grand Canyon National Park (Ariz.)66
- Mesas65
- Petrified Forest National Park (Ariz.)59
- Erosion58
- Trees52
- Deserts51
- Buttes49
- Petrified forests47
- Rocks46
- Shrubs46
- Hills34
- Valleys31
- Mountains29
- Chiricahua National Monument (Ariz.)26
- Rivers22