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Subject
- Canyons1
- Cliffs[remove]1
- Colorado River (Colo.-Mexico)[remove]1
- Colorado River Valley (Colo.-Mexico)1
- Erosion1
- Grand Canyon (Ariz.)1
- Grand Canyon National Park (Ariz.)1
- Lipan Point (Ariz.)1
- National parks & reserves1
- Rivers[remove]1
- Rock formations[remove]1
- Valleys1