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Subject
- Mesas[remove]50
- National parks & reserves[remove]50
- Rock formations[remove]50
- Cliffs47
- Canyons41
- Grand Canyon (Ariz.)37
- Grand Canyon National Park (Ariz.)37
- Erosion34
- Buttes31
- Blue Mesa (Ariz.)10
- Petrified Forest National Park (Ariz.)10
- Petrified forests10
- Trees10
- Deserts9
- Powell Plateau (Ariz.)9
- Rivers7
- Shrubs6
- Valleys6
- Clouds5
- Colorado River (Colo.-Mexico)5