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Tenopir, C.; Ennis, L.: ¬The digital reference work of academic libraries (1998)
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Gandhi, S.: Proliferation and categories of Internet directories : a database of Internet subject directories (1998)
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Dalrymple, P.W.; Roderer, N.K.: Database access systems (1994)
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Nicholls, P.; Sutherland, T.: CD-ROM databases : a survey of commercial publishing activity (1992)
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Dole, J.A.; Sinatra, G.M.: Reconceptualizing change in the cognitive construction of knowledge (1989)
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