DIN 31631: Kategorienkatalog für Dokumente : T.1: Begriffe und Gestaltung (1984) - T.2: Systematischer Teil (1985). - T.2, Bbl 1: Alphabetisches Register zum systematischen Teil (1985) - T.3: Indikator zur Verarbeitungssteuerung von Kategorien (1990) - T.4: Codes für Einträge zu Datenkategorien (1987) - T.5: Behandlung von Datenkategorien mit einem Eintrag oder mehreren Einträgen in Datenformaten (1988) - T.6: Kategorienkatalog für die Beschreibung von Institutionen (1988) - T.7: Ketegorienkatalog für die Beschreibung von Projekten (1989-10) (1984-89)
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