Map record details

Map series Index to colours used on geological maps 
Sheet title An uniform System of Indicoclature ... In the Geological Plans and Sections connected with the Ordnance Survey’. Thomas Colby, Ordnance Survey Office, 9 April 1830. Printed pamphlet, hand coloured, 4 pp. (repaired and bound in covers). [Note: the colour scheme recommended here was never applied to the maps issued for the Ordnance Survey by De la Beche]. BGS Archive No GSM/DC/S/3. 
Publication year 1830 
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