http://dewey.info/scheme/edition/e23/ en
333.8 Subsurface resources
333.82 Fossil fuels
333.821 General topics of fossil fuels 333.822 Coal 333.823 Oil and natural gas
http://dewey.info/scheme/edition/e22/ de
333.8 Unterirdische Ressourcen
333.82 Fossile Brennstoffe
333.822 Kohle 333.823 Erdöl und Erdgas
Dewey Decimal Classification
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