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Subject
- National parks & reserves18
- Petrified Forest National Park (Ariz.)18
- Petrified forests[remove]18
- Rock formations[remove]18
- Deserts15
- Blue Mesa (Ariz.)9
- Erosion9
- Hills8
- Mesas8
- Cliffs7
- Rocks6
- Valleys5
- Grasses4
- Shrubs4
- Jasper Forest (Ariz.)3
- Agate Bridge (Ariz.)2
- Quartz2
- Trees2
- Agates1
- Boulders1