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Unknown. 30-second elements : the 50 most significant elements, each explained in half a minute. Duxford : Icon Books, 2013. http://access.bl.uk/ark:/81055/vdc_100187938234.0x000001
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Unknown. 30-second elements : the 50 most significant elements, each explained in half a minute. Duxford : Icon Books, 2013. http://access.bl.uk/ark:/81055/vdc_100187938234.0x000001