Recapitulation of A Statement submitted by Lieutenant Colonel DesBarres for Consideration Respecting his Services, from the Year 1755, to the prefent time – in the Capacity of an Officer and Engineer during the War of 1756 – The Utility of his Surveys and Publications of the Coafts and Harbours of North America, inituled, The Atlantic Neptun – and his Proceedings and Conduct as Lieutenant Governor and Commander in Chief and Commander in Chief of His Majesty’s Colony of Cape Breton. London Printed by J. Jones, Chapel Street, Soho. 1796. Page 5. This figure is also quoted by Pedley (2005) in Appendix 2 ‘Costs of Map Production in England’, p.226 as the cost of Copperplate and Engraving.