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  • × classification_ss:"Z711"
  1. Reference and information services : an introduction (1991) 4.07 
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  2. Grogan, D.: Grogan's case studies in reference work : Vol.1-6 (1987) 4.07 
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  3. Grogan, D.: Practical reference work (1979) 4.07 
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  4. Reference and information services : an introduction (2001) 4.07 
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  5. Reference and information services : an introduction (1995) 4.07 
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