| Description | A printed appendix from a publication, which includes an extract from George Greenough's address to the Royal Geographical Society, 24 May 1841, regarding map-making. The appendix also includes the text of a letter from Greenough to Sir Charles Trevelyan, sent 22 July 1854, regarding a report on an upcoming ordnance map of Scotland and the use of a 'Copper plate, containing a Natural Scale of Heights'. |