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Van der Walt, H.E.A.; Brakel, P.A. van: Method for the evaluation of the retrieval effectiveness of a CD-ROM bibliographic database (1991) 1.00
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Geyser, E.P.; Brakel, P.A. van: Man-machine interaction as a factor in the design of computerised information retrieval systems (1991) 1.00
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Brakel, P.A. van: CD-ROM encyclopedias (1991) 1.00

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Brakel, P.A. van: Twenty years of training in online searching : integrating the Internet with the teaching programme (1996) 1.00
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