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Subject
- Petrified Forest National Park (Ariz.)[remove]56
- National parks & reserves55
- Petrified forests43
- Deserts35
- Hills32
- Rocks29
- Rock formations26
- Mesas18
- Shrubs18
- Valleys16
- Erosion15
- Fossils15
- Petrified wood15
- Blue Mesa (Ariz.)14
- Cliffs14
- Logs13
- Painted Desert (Ariz.)9
- Boulders7
- Grasses7
- Trees6