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  1. Walford's guide to reference material : Vol.1: Science and technology (1999) 0.01 
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  2. Walford's guide to reference material : Vol.1: Science and technology. 1993. - Vol.2: Social and historical sciences, philosophy and religion. 1994. - Vol.3: Generalia, language and literature, the arts. 1995 (1993-95) 0.01 
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