The history of the United States cent revealed through copper isotope fractionation Mathur, Ryan ; Titley, Spencer ; Hart, Garret ; Wilson, Marc ; Davignon, Michael ; Zlatos, Caitlan Abstract Publication: Journal of Archaeological Science Pub Date: February 2009 DOI: 10.1016/j.jas.2008.09.029 Bibcode: 2009JArSc..36..430M