Ed., reprinted 1946. Survey of India. "Refer to this map as: Four inch Cawnpore guide map, second edition."In upper left margin: Surveyed 1918-19. In lower left margin: "Reg. No. 3052 D'20 (D.O.3-6") 500-500'33-X'46. 1st edition 1920; 2nd edition 1933." Published under the direction of Colonel C. H. D. Ryder, C.I.E., D.S.O., R.E., Surveyor General of India. Kanpur was known as Cawnpore before 1948.