Marietta Earthworks
... that Ohio's first archaeological investigation was conducted at the Marietta Earthworks?
... that <a href="./Ohio" id="mwBXc" rel="mw:WikiLink" title="Ohio">Ohio</a>'s first archaeological investigation was conducted at the <b id="mwBXg"><a href="./Marietta_Earthworks" id="mwBXk" rel="mw:WikiLink" title="Marietta Earthworks">Marietta Earthworks</a></b>?