AT-1068
North American Earthworks: Serpent Mound / Poverty Point / Adena / Hopewell / Cahokia
Why Ancient Inquiry uses this citation here
Ohio History Connection institutional site page for the effigy mound, documented history, and the limits of current dating and attribution claims.
What this usage does not establish
Bibliographic verification does not by itself establish that the full text was read.
Open topic