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Natural formations

  1. Geology

    James Geikie

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    James Geikie
    Geology

  2. Ice-Caves of France and Switzerland

    G. F. Browne

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    G. F. Browne
    Ice-Caves of France and Switzerland

  3. Rambles in the Mammoth Cave, during the Year 1844
By a Visiter

    Alexander Clark Bullitt

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    Alexander Clark Bullitt
    Rambles in the Mammoth Cave, during the Year 1844
By a Visiter
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