This area includes Serpent Mound, Fort Ancient, Mound City and Seip Earthworks (both now part of Hopewell Culture National Historical Park), and Newark Earthworks.
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He assisted Ephraim G. Squier in preparing his Ancient Monuments of the Mississippi Valley (Washington, 1848), and John R. Bartlett in the first edition of his Dictionary of Americanisms, and made the analytical index to the American edition of Napier's Peninsular War.