Walnut Grove
... that exposed oak beams in the plantation house at Walnut Grove reveal Roman numerals marking where joists are to be attached?
... that exposed oak beams in the plantation house at <b id="mwC1E"><a href="./Walnut_Grove_(Spotsylvania_County,_Virginia)" id="mwC1I" rel="mw:WikiLink" title="Walnut Grove (Spotsylvania County, Virginia)">Walnut Grove</a></b> reveal <a href="./Roman_numerals" id="mwC1M" rel="mw:WikiLink" title="Roman numerals">Roman numerals</a> marking where <a href="./Joist" id="mwC1Q" rel="mw:WikiLink" title="Joist">joists</a> are to be attached?