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Subject
- Hills[remove]23
- National parks & reserves23
- Petrified Forest National Park (Ariz.)[remove]23
- Deserts21
- Petrified forests17
- Valleys15
- Erosion10
- Mesas10
- Painted Desert (Ariz.)9
- Rock formations8
- Blue Mesa (Ariz.)7
- Rocks6
- Cliffs5
- Grasses5
- Shrubs4
- Logs3
- Boulders2
- Buttes2
- Rivers2
- Fossils1