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''Public Works in the Bengal Presidency'' by Major General George Borlase Tremenheere , of the Bengal Engineers from Minutes of Proceedings of the Institution of Civil Engineers(Great Britain) 1858 page 483. [http://books.google.com/books?id=WBYAAAAAMAAJ&pg=PA483 Google Books. He also gave evidence in 1858 to a House Of Commons Select Committe on Colonisation and Settlement in India [http://books.google.com/books?id=wrASAAAAYAAJ&pg=PA1 Google Books]