Merrill, Robert H., 1881-1955, “Symphysis of chin,” Digital Collections, accessed December 8, 2025, https://digitalcollections.library.gvsu.edu/document/52655.
Black and white lantern slide depicting the symphysis of chin bones from various specimens, including Chou Kou Tien, a Neolithic Chinese child, a modern human, and a chimpanzee.