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London: British Standards Institution, 2010
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London: British Standards Institution, 1968
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London: British Standards Institution, 1963
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London: British Standards Institution, 1958
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London: British Standards Institution, 1956
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London: British Standards Institution, 1950
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London: British Standards Institution, 1951
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London: British Standards Institution, 1952
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1954
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London: British Standards Institution, 1954
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London: British Standards Institution, 1950
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London, 1951
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London: British Standards Institution, 1954
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London: British Standards Institution, 1950
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London: British Standards Institution, 1951
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London: British Standards Institution, 1953
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London: British Standards Institution, 1953
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London: British Standards Institution, 1953
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London: British Standards Inst., 1950
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London: British Standards Institution, 1952