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Publishers' international ISBN directory : 3 Bde (1996)
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Publishers' international ISBN directory : 3 Bde (1997)
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Publishers' international ISBN directory : 3 Bde (1998)
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Walford's guide to reference material : Vol.1: Science and technology. 1996 (1996)
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Publishers' international ISBN directory : 3 Bde (1999)
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Publishers' international ISBN directory plus : CD-ROM ed (1999)
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Publishers' international ISBN directory plus : CD-ROM ed (1997)
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