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Lea, P.W.; Day, A.: Printed reference material and related information sources (1990)
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¬The reference sources handbook (1996)
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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)
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