1. Country south of the Ganges, from Calcutta to Benares : compiled from the Revenue Survey based on the Great Trigonometrical Operations to 1859 Maps University Of Minnesota Public content 1864. Compiled in the office of the surveyer general of India, January, 1860. 79 x 145 Centimeters Scale 1:506,880. "Scale 8 miles to 1 inch." Ames Libra... Surveyor General's Office (Calcutta).