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*[http://books.google.com/books?id=tE41AAAAMAAJ&pg=PR1 ''A manual of surveying for India, detailing the mode of operations on the revenue surveys in Bengal and the North-western provinces''] by Ralph Smyth and Henry Edward Landor Thuillier 1851 Google Books
*''A Memoir On The Indian Surveys'' by Clements R Markham Archive.org [http://www.archive.org/stream/memoironindiansu00mark#page/n3/mode/2up First Edition 1871], [http://www.archive.org/stream/memoirontheindia025502mbp#page/n1/mode/2up 2nd Edition 1878]
*[https://archive.org/details/accountofsurveyo00trotrich ''Account of the Survey Operations in connection with the Mission to Yarkand and Kashgar in 1873-74''] by Captain Henry Trotter, RE, Deputy Superintendent, Great Trigonometrical Survey of India. 1875 Archive.org
*[http://www.archive.org/stream/waysandworksini02macggoog#page/n34/mode/2up "Great Indian Trigonometrical Survey"] from ''Ways and works in India being an account of the public works in that country from the earliest times up to the present day'' by G. W. Macgeorge 1894 Archive.org
*''Account of the Operations of the Great Trigonometrical Survey of India'' Archive.org
