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  1. Pettee, J.: ¬The subject approach to books and the development of the dictionary catalog (1985) 0.00 
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    Footnote
    Original in: Pettee, J.: The history and theory of the alphabetical subject approach to books. New York: Wilson 1946. S.22-25.
  2. Mooers, C.N.: ¬The indexing language of an information retrieval system (1985) 0.00 
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    Footnote
    Original in: Information retrieval today: papers presented at an Institute conducted by the Library School and the Center for Continuation Study, University of Minnesota, Sept. 19-22, 1962. Ed. by Wesley Simonton. Minneapolis, Minn.: The Center, 1963. S.21-36.

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