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Cape Kumukahi Hawaii
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Mauna Loa Hawaii
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Palmer Station Antarctica
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Utqiaġvik Alaska
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Cape Grim Australia
4
Cold Bay Alaska Bay
4
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4
Niwot Ridge Colorado
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Oxygen
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Barrow Alaska
3
La Jolla Pier San Diego, Calif
3
La Jolla San Diego, Calif
2
Antarctica
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Baja California Sur Mexico
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Christmas Island Kiribati
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Northwest Territory Canada
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Raoul Island Kermadec Islands
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