1. Map of the country bordering the Great Trunk Road between Benares and Dehli : based on the Great Trigangulation and Revenue Survey Operations to 1857 Maps University Of Minnesota Public content 1858. Survey of India. Extracted from an unfinished map of the N W Provinces under compilation in the Surveyor General's Office Calcutta December 1857.; Includes polymatr... Surveyor General's Office (Calcutta).