Region
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Korea
1
Lassen Volcanic National Park
1
Lassen Volcanic National Park (Calif.)
1
Lava Beds National Monument
1
Lava Beds National Monument (Calif.)
1
New Jersey
1
New York
1
New York (State)
1
Niagara Falls (N.Y. and Ont.)
1
Norway
1
Oregon
1
Pacific Coast (Calif.)
1
Paterson
1
Peru
1
Planets
1
Russia
1
Terre
1
Vicksburg National Military Park (Miss.)
1