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porz: Bubbling hot spring
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porz: Bison
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porz: Bison in Yellowstone NP
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porz: Grand canyon of the Yellowstone
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porz: Grand canyon of the Yellowstone
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porz: Grand canyon of the Yellowstone
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porz: Grand canyon of the Yellowstone
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porz: Lower Falls, Yellowstone
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porz: Resting deer
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porz: Mammoth hot springs
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porz: Yellowstone NP
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porz: Norris basin, Yellowstone NP
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porz: Norris geyser basin
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porz: Norris geyser basin
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porz: Norris geyser basin
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porz: Firehole river, Yellowstone NP
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porz: Bacteriae or algae in water flowing to Firehole river from the Grand prismatic spring