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  • × year_i:[1920 TO 1930}
  1. Lysen, A.: ¬Ein "¬verbesserter Index" zum systematischen Katalog (1925) 0.04
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  2. Fellows, D.: Library of Congress Classification vs. decimal classification (1925) 0.02
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  3. Sayers, W.C.B.: ¬A manual of classification for librarians and bibliographers (1926) 0.01
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