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  • × year_i:[1940 TO 1950}
  • × theme_ss:"Informationsdienstleistungen"
  1. Harnack, A. von: ¬Die Auskunftserteilung als bibliothekarische Aufgabe (1940) 0.02 
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    Source
    Zentralblatt für Bibliothekswesen. 57(1940), S.16-22
  2. Hutchins, M.: Introduction to reference work (1944) 0.02 
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