http://dewey.info/scheme/edition/e23/ en
383 Postal communication
383.2 Economic aspects of production
383.23 Rates and costs 383.24 Efficiency of operation
http://dewey.info/scheme/edition/e22/ de
383 Postverkehr
383.2 Wirtschaftliche Aspekte der Produktion
383.23 Geb├╝hren und Kosten 383.24 Betriebliche Effizienz
Dewey Decimal Classification
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