Starch grain analysis reveals function of grinding stone tools at Shangzhai site, Beijing Yang, XiaoYan ; Yu, JinCheng ; Lü, HouYuan ; Cui, TianXing ; Guo, JingNing ; Ge, QuanSheng Abstract Publication: Science China Earth Sciences Pub Date: August 2009 DOI: 10.1007/s11430-009-0089-9 Bibcode: 2009ScChD..52.1164Y