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  • × 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) 8.26 
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  2. Lever, A.J.: Nederlandse basisklassificatie gereed (1989) 8.26 
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