025.5 Services for users
025.52 Reference and information services
025.523 Cooperative information services 025.524 Information search and retrieval 025.525 Selective dissemination of information (SDI) 025.527 Reference and information services in specific types of institutions de
025.5 Dienstleistungen für Benutzer
025.52 Auskunfts- und Informationsdienst
025.523 Kooperativer Informationsdienst 025.524 Informationssuche und Information Retrieval 025.525 Selective dissemination of information (SDI) 025.527 Auskunfts- und Informationsdienst in einzelnen Arten von Einrichtungen
Dewey Decimal Classification
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