Danish historian who investigated the Scandinavian discovery of North America; his 1837 book Antiquitates Americanæ was the first scholarly exposition of the pre-Columbian Norse exploration theory.

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Dictionary of Wisconsin History

Explore more than 1,600 people, places and events in Wisconsin history.

[Source: http://encyclopedia.thefreedictionary.com/; Lapham, Increase. "Selected letters on Indian mounds, 1846-1852" at Turning Points in Wis. History (www.wisconsinhistory.org/turningpoints)]