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Subject
- National parks & reserves[remove]42
- Petrified Forest National Park (Ariz.)37
- Petrified forests31
- Deserts29
- Hills23
- Rock formations22
- Mesas18
- Rocks16
- Valleys15
- Erosion14
- Cliffs13
- Blue Mesa (Ariz.)12
- Shrubs12
- Painted Desert (Ariz.)9
- Grasses8
- Fossils5
- Navajo National Monument (Ariz.)5
- Petrified wood5
- Agates4
- Jasper Forest (Ariz.)4