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Showing 1 - 2 results of 2 for search '"Academy of Natural Sciences of Philadelphia"', query time: 0.25s Refine Results
  1. 1
    The development of geological studies in the Grand Canyon /
    by Spamer, Earle E.
    Published 1989
    Conference Proceeding Book
  2. 2
    Arizona crater: the case for impact.
    by Barringer, D. M.
    Published 1968
    Book
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