Singer, Donald A. Grade and tonnage model of major podiform chromite - Reston, VA U.S. Geological Survey 1986 - pp. 38-44 ilus. - U.S. Geological Survey Bulletin n.1693 . Subjects--Topical Terms: CROMITAGENESIS-YACIMIENTOGEOLOGIA ECONOMICALEY MINERALMODELOS GENETICOSRESERVAS MINERALESYACIMIENTOS PODIFORMES