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  • × author_ss:"Boorkman, J.A."
  • × theme_ss:"Informationsmittel"
  • × language_ss:"e"
  • × year_i:[1990 TO 2000}
  • × type_ss:"m"
  1. Roper, F.W.; Boorkman, J.A.: Introduction to reference sources (1994) 1.00 
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