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http://www.ordnancesurvey.co.uk/docs/ebooks/map-makers-to-britain-since-1791/index.html
Alexander Ross Clarke
Anglo-French Survey (1784–1790)
Principal Triangulation of Great Britain
Ramsden surveying instruments
Retriangulation of Great Britain
William Roy
Link from a Wikipage to an external page
index.html
http://www.ordnancesurvey.co.uk/docs/ebooks/map-makers-to-britain-since-1791/index.html