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  • × theme_ss:"Grundlagen u. Einführungen: Allgemeine Literatur"
  1. Subject retrieval in the seventies: new directions : Proc. of an Int. Symp. ... College Park, 14.-15.5.1971 (1972) 8.06 
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  2. Classification in the 1970s. A second look (1976) 8.06 
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