-
Wellisch, H.H.: Organisatorische Neuordnung des DK-Systems (1971)
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- Source
- Nachrichten für Dokumentation. 22(1971), S.55-63
-
Dahlberg, I.: Major developments in classification (1977)
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- Source
- Advances in librarianship. 7(1977), S.41-103
-
Samurin, E.I.: Geschichte der bibliothekarisch-bibliographischen Klassifikation (1977)
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- Isbn
- 3-7940-7012-7