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Barron, B., M.-C. Mahe (Comp.): an annual guide to Internet-accessible online public access catalogs. Including 'accessing on-line bibliographic databases' : ¬The OPAC directory (1994)
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Opacs in the UK : JANET-OPACs (1991)
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Schuyler, M.: Dial in 1992 : an annual guide to online public access catalogs (1992)
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