1
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AY756 .P42
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Pears Cyclopaedia 1977-78 : A book of background information and reference for everyday use .
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London : Book Club Associates , 1977
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Barker, L.Mary
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2
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RefAY67 .N5
W67
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The World Almanac and Book of Facts .
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New York : World Almanac Books , 2004
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World Almanac Books
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