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1Published 1972“...Ordnance Survey...”
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4Published 1984“...Ordnance Survey...”
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7Published 1978“...Ordnance Survey...”
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8Mapping the world : a history of the Directorate of Overseas Surveys 1946-1985 / Alastair Macdonald.by Macdonald, Alastair“...Ordnance Survey...”
Published 1996
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