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  • × year_i:[1950 TO 1960}
  1. Shera, J.H.: Pattern, structure, and conceptualization in classification for information retrieval (1957) 9.91 
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    Shera, J.H.
  2. Shera, J.H.; Egan, M.: ¬The classified catalog : Basic principles and practices (1956) 9.91 
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