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 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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