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Condizione: Good. 8vo. 15 x 24.5cm. Original buckram. 54pp + 33pp + hors texte plates.Bulletin (Smithsonian Institution. Bureau of American Ethnology), [no. 10]OCLC Number / Unique Identifier:1300816762 and OCLC Number / Unique Identifier:2915643.the culmination of a longer study of ancient mounds in the Ohio Valley and the earthworks of Ohio's Hopewell Culture. The book explores the mystery of these ancient constructions, focusing on the Great Circle, Square, and Octagon earthworks in Newark, Ohio, which exhibit an advanced understanding of geometry and astronomy. The work also addresses theories about the purpose of the mounds, which were built for ceremonial or burial purposes by the Hopewell and Adena cultures over 2,000 years ago, according to the Ohio History Connection and BBC.…