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Subject
National parks & reserves
33
Petrified Forest National Park (Ariz.)
33
Deserts
30
Petrified forests
27
Hills
24
Rock formations
20
Mesas
17
Valleys
15
Erosion
14
Blue Mesa (Ariz.)
12
Rocks
12
Painted Desert (Ariz.)
11
Cliffs
9
Shrubs
9
Grasses
7
Jasper Forest (Ariz.)
4
Logs
3
Quartz
3
Agate Bridge (Ariz.)
2
Boulders
2