A map of the portsmouth earthworks, group c, a hopewellculture series of mounds located in en:greenup county, kentucky. It is part of a larger earthworks complex, the portsmouth earthworks, located across the en:ohio river in en:portsmouth, ohio. It is located near the biggs site, which is also known as "portsmouth earthworks, group d". Date: 1846.
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