Merrill, Robert H., 1881-1955, “Mastodon rib 45N 78W N at 20',” Digital Collections, accessed April 9, 2025, https://digitalcollections.library.gvsu.edu/document/50431.
Black and white photograph of a man sitting next to a hole in the ground writing on a piece of paper. A mastodon rib is visible in the hole surrounded by measuring sticks.