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Effigy mounds

Effigy mounds, prehistoric Native American burial mounds in northeastern Iowa. Located west of the Mississippi River, the mounds were probably constructed about A.D. 1000. There were probably about 100,000 mounds, many in the form of birds or animals, but many have been destroyed by farming.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Dream to Eijkman, Christiaan