In this 4.25" by 6.25" (10.80 by 15.88 cm) image, William C. Mills, archeologist and curator for the Ohio Archeological and Historical Society (now called the Ohio Historical Society), observes workmen at the excavation site of Tremper Mound in Scioto County, Ohio. The excavation took place in July and August, 1915. A collection of sixty effigy pipes created by the prehistoric Hopewell people were unearthed.

In Ohio, the Hopewell Indians (100 B.C.-A.D. 500) built burial mounds and large earthen enclosures in geometric shapes (circles, squares, and octagons) to mark the places where the people gathered periodically to participate in many social and ceremonial events. Some of these sites were quite large; the Newark Earthworks complex spread over a 4-square-mile area. The Hopewell people also maintained a large trade network extending as far as the Rocky Mountains of Wyoming, the Florida coast and Appalachians, and northern Lake Superior.