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  • × author_ss:"Derr, R.L."
  1. Derr, R.L.: Questions: definitions, structure, and classification (1985) 4.07 
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  2. Derr, R.L.: Information seeking expressions of users (1984) 4.07 
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  3. Derr, R.L.: ¬A conceptual analysis of information need (1983) 4.07 
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