Excavations at Seibal, Department of Peten, Guatemala - Willey, Gordon R. (Gordon Randolph), 1913-2002; Graham, John Allen; Tourtellot, Gair; Pohl, Mary; Willey, Gordon R. (Gordon Randolph), 1913-2002 (Peabody Museum of Archaeology and Ethnology, Harvard University, 1990)