Surveyed in May 1853. Scale of 1,000 Yards to an Inch. Arthur Bedford, River Surveyor, May 17th 1853. Lithographed & Sold by T. Black, Asiatic Lithographic Press, Calcutta.
As surveyed in July 1862. Scale 1000 [i.e. 2000] yards to an Inch. Joseph Obbard, River Surveyor, Salween S.V., Rangafulla Channel, the 28th July 1862. Manuscript copy by Barlow. 'Reduced Copy, half the original Scale.' Formerly numbered 4.
As surveyed in Novem: & Dec: 1859 & January 1860. Scale One Inch to 2000 yards. J. Obbard, Salween R. Surv: Vessel, March 17, 1860. T. Black Lith: Calcutta. Manuscript tracing by Barlow, mounted on paper.
As surveyed in October 1856. Scale of a thousand yards to an inch. Joseph Obbard, River Surveyor, H.C.S.V. Cavery, 7th Novr. 1856. T. Black, Asiatic Litho. Press, 4 Waterloo Street, Calcutta. Formerly numbered 2.
[11f] Rough manuscript table by Barlow (subsequently abandoned) of surveys, with surveyors and dates, for stretches of River Hooghly from Kulpee, Mud Point and Cowcolly with different extents.
Surveyed July 1864. Scale 2000 yards to 1 Inch. F. Laycock, Offg. River Surveyor, Salween S.V., off Calcutta, Aug. 10, 1864. Manuscript copy by Barlow. 'Reduced from 1000 yards to the Inch.'