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==External links==
*[http://www.bl.uk/eblj/1991articles/pdf/article10.pdf "Colin Mackenzie: Collector Extraordinary"] by David M.Blake ''British Library Journal 1991'' pages 128-150. Mackenzie was an officer in the Madras Engineers and had arrived in Madras in 1793. At the time of his death in 1821, he was Surveyor-General of India.
*[https://web.archive.org/web/20091229122957/http://www.ces.iisc.ernet.in/biodiversity/sahyadri/wgbis_info/trigonometrical_survey.htm "The Trigonometrical Survey"] by FC Danvers (a transcript of an article, possibly that in ''Quarterly Journal of Science VII 1870'' pages 448-458) ces.iisc.ernet.in (archive.org link)
*[https://web.archive.org/web/20140125140842/http://www.new1.dli.ernet.in/data1/upload/insa/INSA_1/20005b5b_22.pdf "The Great Trigonometrical Survey of India in a Historical Perspective"] by Rana Deb Roy ''Indian Journal of History of Science'' 21(1):22-32 (1986)
