Any readers of this blog who use twitter ought to follow this user:
In 1891 the Smithsonian's Bureau of Ethnology issued a series of maps and a catalog of the burial, effigy, linear, midden, stone and shell mounds, and earthworks they had identified. This is their map of Ohio. The black hat-like dots are mound sites. If it was redone today, the bottom half of the state would be nearly covered.
The book he refers to is available here:
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