621.31 Generation, modification, storage, transmission of electric power
621.312 Generation, modification, storage
621.3121 Generation 621.3124 Direct energy conversion 621.3126 Modification and storage de
621.31 Erzeugung, Modifikation, Speicherung, √úbertragung elektrischer Energie
621.312 Erzeugung, Modifikation, Speicherung
621.3121 Erzeugung 621.3124 Energiedirektumwandlung 621.3126 Modifikation und Speicherung
Dewey Decimal Classification
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