Tibet. Revised Sketch Map Illustrating the Explorations of A-- K-- in Great Tibet and Mongolia, 1879-82. Survey of India, Jun 1884. 16 miles = 1 inch. Three sheets.
Tibet. Survey of India, North East Frontier, Sheet 5-12/6-13, 1897. 16 miles = 1 inch. Colourists' specimen copy, signed and annotated, 1898 and later.
North-East Frontier. Sketch Map to Show Routes Leading from Sikkim to Lhasa, reduced from map by Captain W.F. O'Connor, R.A., Gangtok, 3 Feb 1903. Intelligence Branch Topo. Dy. No. 4704, 1903. 16 miles = 1 inch.
Tibet. Skeleton Map of Tibet from the Sikkim Frontier to Lhasa, reduced from a map by Captain W.F. O'Connor, R.A. dated 12 Feb 1903. Intelligence Branch Topo. Dy. No. 4,721, Feb 1903. 16 miles = 1 inch.
Tibet. Road Sketch, Gyantse to Karo La and Tibetan Wall, from road sketches by Captain H.M. Cowie, R.E., Survey of India, dated May 1904. Intelligence Branch Topo. Dy. No. 5,144, 1904. 4 miles = 1 inch.
Northern Trans-Frontier. Sketch Map of Routes Traversed by European and Asiatic Explorers beyond the British Frontier from 1865 to 1903. Survey of India, Jan 1905. 64 miles = 1 inch.