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Erika & Rüdiger: Green River Valley
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Erika & Rüdiger: Dixon Cave
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Erika & Rüdiger: White-tailed deer (Odocoileus virginianus)
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Erika & Rüdiger: Historic Tour
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Erika & Rüdiger: Huge tunnels in Historic Tour
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Erika & Rüdiger: Historic Tour
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Erika & Rüdiger: Historic Tour
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Erika & Rüdiger: Mammoth Dome
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Erika & Rüdiger: Mammoth Dome
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Erika & Rüdiger: Mammoth Dome
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Erika & Rüdiger: Historic Tour
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Erika & Rüdiger: Historic entrance
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Erika & Rüdiger: Domes and driptones tour
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Erika & Rüdiger: Frozen Niagara
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Erika & Rüdiger: Frozen Niagara
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Erika & Rüdiger: Frozen Niagara
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Erika & Rüdiger: Frozen Niagara room
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Erika & Rüdiger: Frozen Niagara room
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Erika & Rüdiger: Frozen Niagara room
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Erika & Rüdiger: Frozen Niagara
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Erika & Rüdiger: Flowstone
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Erika & Rüdiger: Stalagmite...
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Erika & Rüdiger: Flowstone
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Erika & Rüdiger: Downtown Chicago
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Erika & Rüdiger: The Cloud Gate
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Erika & Rüdiger: Crown Fountain
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Erika & Rüdiger: Crown Fountain
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Erika & Rüdiger: Towers by Chicago River
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Erika & Rüdiger: Chicago
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Erika & Rüdiger: Untitled by Picasso (1967)