Plate XXXV from <a href="https://en.wikipedia.org/wiki/Ancient_Monuments_of_the_Mississippi_Valley" class="extiw" title="w:Ancient Monuments of the Mississippi Valley">Ancient Monuments of the Mississippi Valley</a>. <a href="https://en.wikipedia.org/wiki/Serpent_Mound" class="extiw" title="w:Serpent Mound">Great Serpent</a> in <a href="https://en.wikipedia.org/wiki/Adams_County,_Ohio" class="extiw" title="w:Adams County, Ohio">Adams County, Ohio</a>.
<a href="https://en.wikipedia.org/wiki/E._G._Squier" class="extiw" title="w:E. G. Squier">Ephraim George Squier</a> and <a href="https://en.wikipedia.org/wiki/Edwin_Hamilton_Davis" class="extiw" title="w:Edwin Hamilton Davis">Edwin Hamilton Davis</a>
<a href="https://en.wikipedia.org/wiki/Ancient_Monuments_of_the_Mississippi_Valley" class="extiw" title="w:Ancient Monuments of the Mississippi Valley">Ancient Monuments of the Mississippi Valley</a> at <a rel="nofollow" class="external autonumber" href="http://www.wdl.org/en/item/4301/">[1]</a>