Joseph Leidy Correspondence (Photocopies), ANSP-Coll-0001-B, Box: 5; Box: 4; Box: 1; Box: 3; Box: 2. Academy of Natural Sciences of Drexel University.
Joseph Leidy Correspondence (Photocopies), ANSP-Coll-0001-B, Box: 5; Box: 4; Box: 1; Box: 3; Box: 2. Academy of Natural Sciences of Drexel University. https://archivalcollections.drexel.edu/repositories/3/resources/276 Accessed May 16, 2024.
