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OECD International Trade
International Trade By Commodity Statistics (SITC Rev. 3)
2: Crude materials, inedible, except fuels
28: Metalliferous ores and metal scrap
287: Ores and concentrates of base metals, n.e.s.
2878: Ores of molybebd., niobium, tant., tit., vanad., zirco.
28785: Niobium, tantalum or vanadium ores & concentrates
28785: Niobium, tantalum or vanadium ores & concentrates
28785: Niobium, tantalum or vanadium ores & concentrates
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