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*[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)
*[http://www.new.dli.ernet.in/rawdataupload/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)
*[http://timesofindia.indiatimes.com/india/Man-who-mapped-India-sits-forgotten-under-tree/articleshow/20512569.cms Man who mapped India sits forgotten under tree] by M T Saju, June 10, 2013, ''Times of India''. This article is about the bust of William Lambton, who launched his work for the Great Trigonometrical Survey on top of St Thomas Mount. On FIBIS on Facebook, Harshawardhan Bosham Nimkhedkar commented on 10 June 2013: Lambton died in Hinganghat, a small town in (the present-day) Chandrapur district of the western state of Maharashtra (about 100 kilometres from Nagpur). He was travelling up north, doing his survey work but fell ill near Hinganghat and died due dysentery. John Keay in his wonderful book The Great Trigonometrical Survey of India gives the details. Keay also discovered Lambton's crumbling tomb in a Moslem graveyard in Hinganghat and photographed it. Lambton was succeeded by George Everest (pronounced Eve-rest), after whom the world's tallest peak Mount Everest in the Himalayas is named.
*[http://www.new.dli.ernet.in/rawdataupload/upload/insa/INSA_1/20005abc_47.pdf "Making Mountains out of Molehills? George Everest and Henry Barrow 1830-39"] by Jane Insley ''Indian Journal of History of Science'' 30 (1) 1995, pages 47-55. Henry Barrow was the first Mathematical Instrument Maker chosen by George Everest to set up and run a workshop for the repair of defective equipment for the Survey of India.
*[http://www.banglapedia.org/httpdocs/HT/L_0053.HTM Land Surveys] Banglapedia (National Encyclopaedia of Bangladesh). It is stated "The objectives of the revenue survey were to make accurate maps of the village boundaries and, sometimes, of the estate boundaries, showing topographical details, compiling certain statistical data for general administrative purposes, and making maps (usual scale: 4 inches = 1 mile and 1 inch = 1 mile) of each village and pargana"
