Ancient works, Marietta, Ohio. Library of Congress: American Memory, First American West: The Ohio River Valley, 1750-1820. Ancient monuments of the Mississippi Valley, Image 1 of 21. Originally published in William Cullen Bryant and Sydney Howard Gay, <i>A Popular History of the United States</i>, Vol I (1888), p. 24.
1888
<a rel="nofollow" class="external text" href="http://lcweb2.loc.gov/cgi-bin/ampage?collId=icufaw&amp;fileName=bbc0007/icufawbbc0007.db&amp;recNum=0">Ancient monuments of the Mississippi Valley</a>, Library of Congress