http://dewey.info/scheme/edition/e23/ en
621.3104 Special topics of generation, modification, storage, transmission of electric power
621.31042 Electrical machinery and equipment
http://dewey.info/scheme/edition/e22/ de
621.3104 Spezielle Themen zu Erzeugung, Modifikation, Speicherung, √úbertragung elektrischer Energie
621.31042 Elektrische Maschinen und Ausstattung
Dewey Decimal Classification
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