Geological Society of Pennsylvania, Philadelphia, Papers, ANSP-Coll-0392, Box: Oversize Small Collections 7; Box: Small Collections 9. Academy of Natural Sciences of Drexel University.
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Geological Society of Pennsylvania, Philadelphia, Papers, ANSP-Coll-0392, Box: Oversize Small Collections 7; Box: Small Collections 9. Academy of Natural Sciences of Drexel University. https://archivalcollections.drexel.edu/repositories/3/resources/715 Accessed May 19, 2024.
