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Subject
Rocks
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172
Shrubs
87
Mountains
81
Rock formations
72
Trees
56
Cliffs
50
National parks & reserves
46
Grasses
44
Canyons
39
Hills
33
Petrified Forest National Park (Ariz.)
32
Roads
31
Petrified forests
28
Deserts
27
Cactus
26
Santa Catalina Mountains (Ariz.)
23
Boulders
20
Fossils
17
Petrified wood
17
Automobiles
14