Schaller, Waldemar T. Zirconium and rare-earth minerals in 1916. - Washington, D.C. Government Printing Office 1917 - pp. 377-386 - Mineral Resources of the United States, 1916-Part II . Impreso Zirconio y minerales de tierras raras. Ingles Subjects--Topical Terms: MINERIACIRCONIO Subjects--Index Terms: OTROS MINERALES Dewey Class. No.: 546.513