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Effigy Mounds National Monument
Nonnative Species
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Did You Know?
In 1880, Alfred J. Hill and Theodore H. Lewis formed the Northwestern Archeological Survey for the purpose of surveying mounds in the Upper Mississippi Valley. Lewis spent eleven field seasons in Iowa and was the first to map mounds in the present Effigy Mounds National Monument.
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Last Updated: January 25, 2009 at 20:05 EST |