http://dewey.info/scheme/edition/e23/ en
658.87 Marketing channels
658.872 Telemarketing and direct marketing
658.872028546 Extranets (Computer networks)--online marketing
http://dewey.info/scheme/edition/e22/ de
658.87 Absatzwege
658.872 Telemarketing und Direktmarketing
658.872028546 Extranets (Computernetze)—Online-Marketing
Dewey Decimal Classification
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