Possible sources and origins of lead in present-day East Antarctic snow. - C. BARBANTE; C. TURETTA; T. BELLOMI; A. GAMBARO; I. MORET; SCARPONI, Giuseppe (Comitato Glaciologico Italiano:DIP Scienze Terra, V Acc Scienze 5, I 10123 Turin Italy:011 39 011 67007157, EMAIL: gfd@dstunivpi.it, Fax: 011 39 011 6707155, 1997)