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  • × author_ss:"Shera, J.H."
  • × year_i:[1950 TO 1960}
  1. Shera, J.H.: Pattern, structure, and conceptualization in classification for information retrieval (1957) 1.00 
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  2. Shera, J.H.; Egan, M.: ¬The classified catalog : Basic principles and practices (1956) 1.00 
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