14, 3–31* Schneider, David (October 1996) "A Spinning Crystal Ball", Scientific American* Wegener, Alfred (1915) "The Origin of Continents and Oceans"
14, 3–31* Schneider, David (October 1996) "A Spinning Crystal Ball", Scientific American* Wegener, Alfred (1915) "The Origin of Continents and Oceans"