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Cochrane, P.A.: Elsinore revisited (1994)
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Gil-Leiva, I.; Munoz, V.R.: ¬Los origines del almacenamiento y recuperacion de informacion (1996)
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Buckland, M.: Emanuel Goldberg, electronic document retrieval, and Vannevar Bush's Memex (1992)
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Bell, H.K.: History of indexing societies : Pt.3: Society of Indexers 1968-1977 (1998)
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