By Aylett, John F.
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By Booth, M., Culpin, Christopher, Macintosh, H.G.
By Lancaster, Tony
By Adams, Ros
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By Hachette Children's Books
By School Mathematics Project
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By Education & Science, Dept.of
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By School Mathematics Project, School
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By Bourdais, Danièle, Finnie, Sue, Adams, Julie
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