Mill Creek chert
... that Mill Creek chert was one of the major exported raw materials of the Mississippian culture?
... that <b id="mwAk0"><a href="./Mill_Creek_chert" id="mwAk4" rel="mw:WikiLink" title="Mill Creek chert">Mill Creek chert</a></b> was one of the major exported raw materials of the <a href="./Mississippian_culture" id="mwAk8" rel="mw:WikiLink" title="Mississippian culture">Mississippian culture</a>?