Reed, Bruce L. Descriptive model of alluvial placer Sn - Reston, VA U.S. Geological Survey 1986 - p. 275 - U.S. Geological Survey Bulletin n.1693 . Subjects--Topical Terms: ESTAŅOGENESIS-YACIMIENTOGEOLOGIA ECONOMICAMODELOS GENETICOSPLACERESPROSPECCION MINERA