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  • × language_ss:"nl"
  • × type_ss:"a"
  • × year_i:[1980 TO 1990}
  1. Lever, A.J.: ¬Een basisclassificatie in ontwikkeling : naar coördinatie van de collectievorming en gemeenschappelijke onderwerpsontsluiting bij wetenschappelijke bibliotheken (1988) 0.04 
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  2. Voorbij, H.: ¬De ontwikkeling van het onderwerpsontsluitingssysteem t.b.v. de Nederlandse Bibliografie (1981) 0.02 
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