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Subject
- Petrified Forest National Park (Ariz.)[remove]26
- Rock formations[remove]26
- National parks & reserves25
- Petrified forests23
- Deserts18
- Hills14
- Blue Mesa (Ariz.)11
- Cliffs11
- Rocks11
- Erosion10
- Mesas10
- Shrubs9
- Valleys5
- Boulders4
- Grasses4
- Agate Bridge (Ariz.)3
- Jasper Forest (Ariz.)3
- Trees3
- Buttes2
- Canyons2