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  1. The Solution of the Pyramid Problem  
    nookbook
  2. The Solution of the Pyramid Problem or, Pyramide Discoveries with a New Theory as to their Ancient Use (Illustrated with active TOC)  
    nookbook
  3. The Solution of the Pyramid Problem, Or, Pyramide Discoveries With a New Theory as to Their Ancient Use  
    nookbook
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  6. Volcanoes in Human History: The Far-Reaching Effects of Major Eruptions  
    nookbook
  7. The Sea around Us  
  8. Volcanoes in Human History: The Far-Reaching Effects of Major Eruptions  
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