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  • × language_ss:"e"
  • × theme_ss:"Informationsmittel"
  • × type_ss:"m"
  1. Bourne, C.P.; Hahn, T.B.: ¬A history of online information services : 1963-1976 (2003) 0.00 
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  2. Katz, W.A.: Introduction to reference work : Vol.1: Basic information sources; vol.2: Reference services and reference processes (1992) 0.00 
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  3. Janes, J.: Introduction to reference work in the digital age. (2003) 0.00 
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