Não informado. (2021). Annual Bulletin of Coal Statistics for Europe and North America. United Nations.
Citace podle Chicago (17th ed.)Não informado. Annual Bulletin of Coal Statistics for Europe and North America. New York: United Nations, 2021.
Citace podle MLA (8th ed.)Não informado. Annual Bulletin of Coal Statistics for Europe and North America. United Nations, 2021.
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