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*[https://archive.org/details/majorjamesrennel00markuoft ''Major James Rennell and the rise of modern English geography''] by Clements R Markham 1895 Archive.org. Rennell arrived in India with the Royal Navy in 1760, transferred to the East India Company in 1763, and in 1764 was appointed Surveyor-General of Bengal, and also was commissioned as a ensign in the Bengal Engineers, aged 21. He remained in India until 1777. [http://en.wikipedia.org/wiki/James_Rennell James Rennell] Wikipedia. Also see [[Gazetteers]]

*[http://books.google.com.au/books?id=eDNcAAAAcAAJ&pg=PP1 ''Memoir of Lieut.-Col. John Macdonald''] 1831 Google Books. He became a cadet of the Bombay Army in 1780, first in the infantry , then the Engineers. In 1782 he joined the Bengal Engineers and was sent to Bencoolen and mainly performed survey work in this area until 1796. (Note, an unrelated book follows the ''Memoir'')

*[http://books.google.com.au/books?id=6wbmMHtf-FwC&pg=PP11 ‪''Memorials of Service in India‬: ‪from the correspondence of the late Major Samuel Charters Macpherson‬ Political Agent at Gwalior during the Mutiny, and formerly employed in the suppression of human sacrifices in Orissa''] 1865 Google Books. [https://archive.org/details/memorialsofservi00macprich Archive.org] (has better maps) He initially joined the Madras Army in 1827. In 1831 he was appointed assistant surveyor-general and was engaged in both military and survey work. In 1841 he was appointed as Assistant to the Agent at Ganjam, Political Agent at Bhopal in 1853, and Political Agent at Gwalior in 1854.

*[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