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Oklahoma 11
Texas 7
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Montana 3
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Arizona 2
Colorado 2
Idaho 2
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New Mexico 2
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Canada 1
China 1
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Europe 1
Glacier National Park (Mont.) 1
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Grundy County 1
Guadalupe Mountains (N.M. and Tex.) 1
Illinois 1
Jackfork Formation (Ark. and Okla.) 1
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Kaibab Limestone 1
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Kentucky 1
Lincoln County 1
Louisiana 1
Maine 1
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North Park 1
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Pennsylvania 1
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West (U.S.) 1
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Wichita Mountains Wildlife Refuge 1
Will County 1
Yukon 1