333.8 Subsurface resources
333.82 Fossil fuels
333.821 General topics of fossil fuels 333.822 Coal 333.823 Oil and natural gas de
333.8 Unterirdische Ressourcen
333.82 Fossile Brennstoffe
333.822 Kohle 333.823 Erdöl und Erdgas
Dewey Decimal Classification
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