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O'Leary, M.: ProQuest direct delivers UMI goods (1996)
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Machovec, G.S.: Electronic journal market overview in 1997 : part 2 - the aggregators (1997)
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Tenopir, C.: Linking to full texts (1998)
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UMI's ProQuest Direct now available on World Wide Web (1996)
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UMI introduces new ProQuest databases (1998)
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