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Peru | |
| Hewett, D. F. (1910) Vanadium Deposits in Peru. Transactions of the American Institute of Mining, Metallurgical Engineering 40:274-299 |
| Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York. Hillibrand, W.F. (1907) Vanadium sulphide, patronite, and its mineral associates from Minasragra, Peru. American Journal of Science: 24: 141-151. Hewett, F. (1906) A new occurrence of vanadium in Peru. Engineering and Mining Journal: 82: 385-385. Bravo (1906) Informaciones y Memorias Soc. Eng., Lima: 8: 171. |
Ragra Mine, Huayllay District, Pasco Province, Pasco, Peru