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Subject
- National parks & reserves[remove]55
- Petrified Forest National Park (Ariz.)55
- Petrified forests43
- Deserts35
- Hills32
- Rocks29
- Rock formations25
- Mesas18
- Shrubs17
- Valleys16
- Fossils15
- Petrified wood15
- Blue Mesa (Ariz.)14
- Erosion14
- Cliffs13
- Logs13
- Painted Desert (Ariz.)9
- Boulders7
- Grasses7
- Trees6