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Subject
National parks & reserves
24
Petrified Forest National Park (Ariz.)
24
Deserts
23
Petrified forests
23
Hills
15
Rock formations
15
Mesas
13
Blue Mesa (Ariz.)
12
Erosion
12
Rocks
9
Valleys
9
Grasses
8
Cliffs
6
Jasper Forest (Ariz.)
4
Painted Desert (Ariz.)
4
Logs
3
Quartz
3
Rivers
2
Agate Bridge (Ariz.)
1
Buttes
1
