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Subject
- Deserts[remove]54
- National parks & reserves[remove]54
- Petrified Forest National Park (Ariz.)36
- Hills29
- Petrified forests26
- Shrubs23
- Rock formations22
- Mesas19
- Rocks19
- Valleys16
- Saguaro National Park (Ariz.)15
- Erosion14
- Mountains14
- Blue Mesa (Ariz.)13
- Cactus12
- Cliffs11
- Saguaro11
- Painted Desert (Ariz.)9
- Grasses8
- Boulders6