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Subject
- Deserts10
- Hills[remove]10
- National parks & reserves[remove]10
- Petrified Forest National Park (Ariz.)10
- Petrified forests10
- Blue Mesa (Ariz.)7
- Mesas7
- Valleys7
- Erosion6
- Rock formations5
- Painted Desert (Ariz.)3
- Logs2
- Rivers2
- Rocks2
- Cliffs1
- Grasses1
- Shadows1