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Broadhurst, R.: ¬The digitisation of library material (1993)
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Guenette, D.R.: Document imaging, CD-ROM, and CD-R : a starting point (1996)
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Silvester, J.P.; Genuardi, M.T.; Klingbiel, P.H.: Machine-aided indexing at NASA (1994)
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Lancaster, F.W.: Trends in subject indexing from 1957 to 2000 (1980)
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Milstead, J.L.: Methodologies for subject analysis in bibliographic databases (1992)
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