Philip Powell Calvert, 1871-1961. Early observations and field notes, 1885-88., ANSP-Coll-0933, Box: Small Collections 16. Academy of Natural Sciences of Drexel University.
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Philip Powell Calvert, 1871-1961. Early observations and field notes, 1885-88., ANSP-Coll-0933, Box: Small Collections 16. Academy of Natural Sciences of Drexel University. https://archivalcollections.drexel.edu/repositories/3/resources/868 Accessed May 16, 2024.
