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Subject
- National parks & reserves[remove]30
- Petrified Forest National Park (Ariz.)30
- Petrified forests24
- Rocks23
- Fossils18
- Petrified wood18
- Shrubs14
- Hills13
- Logs11
- Rock formations10
- Deserts8
- Boulders7
- Cliffs7
- Trees5
- Agates4
- Agate House (Ariz.)3
- Houses3
- Mesas3
- People3
- Rock art3