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Henry, M.K.; Keenan, L.; Reagan, M.: Search sheets for OPACs on the internet : a selective guide to U.S. OPACs utilizing VT100 emulation (1991)
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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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Peters, T.A.: ¬The online catalog : A critical examination of public use (1991)
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