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  • × theme_ss:"Informationsdienstleistungen"
  1. Derr, R.L.: Questions: definitions, structure, and classification (1985) 9.91 
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    Derr, R.L.
  2. Derr, R.L.: Information seeking expressions of users (1984) 9.91 
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  3. Derr, R.L.: ¬A conceptual analysis of information need (1983) 9.91 
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