http://dewey.info/scheme/a14/ en
333 Economics of land and energy
333.8 Subsurface resources
http://dewey.info/scheme/a14/ vi
333 Kinh tế học đất đai và năng lượng
333.8 Tài nguyên dưới mặt đất
http://dewey.info/scheme/a14/ it
333 Economia della terra (Economia fondiaria) e dell'energia
333.8 Risorse del sottosuolo
http://dewey.info/scheme/edition/e23/ en
333 Economics of land and energy
333.8 Subsurface resources
333.81 General topics of subsurface resources 333.82 Fossil fuels 333.85 Minerals 333.88 Geothermal energy
http://dewey.info/scheme/edition/e22/ de
333 Boden- und Energiewirtschaft
333.8 Unterirdische Ressourcen
333.82 Fossile Brennstoffe 333.85 Mineralische Rohstoffe 333.88 Geothermische Energie
Dewey Decimal Classification
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