Native American artifacts believed to date back thousands of years have been recovered from the planned site of a new industrial plant in southwest Ohio. SunCoke Energy Inc. found some items as it prepared to build a plant to help supply coke for AK Steel's Middletown Works. The Knoxville, Tenn.-based company hired an archaeological firm to excavate two sites near a creek. Officials say several hundred prehistoric artifacts were recovered, mostly fragments from arrowheads, spearheads, and evidence of stone tool making. They are believed to be from the era between 8000 B.C. and 1200 A.D. [...]