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  • × author_ss:"Halldorsson, E.A."
  • × year_i:[1970 TO 1980}
  • × theme_ss:"Informationsdienstleistungen"
  • × language_ss:"e"
  1. Halldorsson, E.A.; Murfin, M.E.: ¬The performance of professionals and non-professionals in the reference interview (1977) 1.00 
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