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Duckett, B.: Reference and information services (2000)
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Grogan, D.: Grogan's case studies in reference work : Vol.1-6 (1987)
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Blake, N.: Enquiry statistics : an analysis of enquiries asked at selected public and special libraries in the UK (1995)
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Davis, P.J.: Rationalized cataloguing and the new authorities (1975)
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Morris, B.: ¬The way ahead (1996)
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