Merrill, Robert H., 1881-1955, “Gatun Locks,” Digital Collections, accessed February 16, 2025, https://digitalcollections.library.gvsu.edu/document/50291.
Black and white photograph of steamships passing thorugh the Gatun Dam locks in Panama. Several people are standing along the edge of the lock to watch the ships pass. "Gatun Locks." is written on the bottom of the image.