Survey of India. "Refer to this map as: Twelve inch town guide map of Cawnpore City, first edition". In upper left margin: surveyed 1918-19. In lower left margin: "Reg. No. 4580 H.D. '48-4800. 1st edition 1921." Published under the direction of Colonel C. H. D. Ryder, C.I.E., D.S.O., R.E., Surveyor General of India, 1921.