The latest historical marker erected by the Bulloch County Historical Society has two sides: one honoring the Ridgon Cemetery; the other, commemorating Rigdon’s Mill. As the dedication ceremony Thursday revealed, there could be a third, marking their Irish connections. It was a sunny first day of spring, three days after St. Patrick’s Day, when the circle gathered in the shade of a cedar in the Rigdon Cemetery, on Lakeview Road north of Statesboro. The marker, in the corner o