United Nations
United Nations international classification for reserves/resources
United Nations international classification for reserves/resources
. : solid fuels and mineral commodities . - Bélgica : United Nations, 1997 . - 174 p ; 30 cm . - IGM
United Nations /
ONU. Economic Commission for Europe / Committee on Sustainable Energy /
8775 (Biblioteca Economia) - 300100008692
United Nations international classification for reserves/resources
. : solid fuels and mineral commodities . - Bélgica : United Nations, 1997 . - 174 p ; 30 cm . - IGM
United Nations /
ONU. Economic Commission for Europe / Committee on Sustainable Energy /
8775 (Biblioteca Economia) - 300100008692
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