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...Markus: Grand Canyon of the Yellowstone
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...Markus: Steam Bath
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...Markus: Bison at Grand Prismatic Spring
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...Markus: Heart Spring
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...Markus: 24mm wasn't wide enough
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...Markus: Bacterial Mat
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...Markus: Grand Canyon of the Yellowstone
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...Markus: Dead Tree at Mammoth Hot Springs
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...Markus: Bacterial Mat