http://dewey.info/scheme/edition/e23/ en
665.7 Natural gas and manufactured gases
665.74 Storage, transportation, distribution of natural gas and manufactured gases
665.742 Storage 665.743 Transportation 665.744 Pipeline transportation
http://dewey.info/scheme/edition/e22/ de
665.7 Erdgas und technische Gase
665.74 Lagerung, Transport, Distribution von Erdgas und technischen Gasen
665.742 Lagerung 665.743 Transport 665.744 Rohrleitungstransport
Dewey Decimal Classification
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