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Subject
National parks & reserves
24
Petrified Forest National Park (Ariz.)
24
Petrified forests
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24
Rocks
19
Fossils
18
Petrified wood
18
Shrubs
13
Logs
11
Hills
9
Rock formations
8
Cliffs
6
Trees
5
Agates
4
Deserts
4
Agate House (Ariz.)
3
Boulders
3
Houses
3
Stonework
3
Walls
3
Women
3