Note 25 — Chapter V · MOUNDS AND EARTHWORKS IN OHIO. Ancient Fortified Inclosures at Circleville.—Discoveries in a Burial Mound.—Alligator Totem near Newark.—Fort Ancient.—Age of Trees growing upon the Ramparts at Fort Hill.—Traditions.—Geometrical Ground Plans of Indian Inclosures.—Conclusions.
Reading edition
Second Annual Report of the Geological Survey of the State of Ohio, 1838, pp. 269.