As surveyed in October 1857. Scale of a thousand Yards to the Inch. Joseph Obbard, River Surveyor, H.C.S.V. Spy, 18th Novr. 1857. T. Black, Lithr: 4 Waterloo Street, Calcutta. Manuscript additions by Barlow. Formerly numbered 4.
As surveyed in September and October 1858. Scale a thousand Yards to an Inch. Joseph Obbard, River Surveyor, H.C.S.V. Spy, off Calcutta, 27th Octr. / 58. T. Black, Lithr:, 4 Waterloo St., Cal:.
As surveyed in November 1858. Scale One thousand Yards to the Inch. Joseph Obbard, River Surveyor. Published & Lithd. by T. Black & Co., 4 Waterloo Street, Calcutta.
As surveyed in October 1860. Scale of a thousand yards to the Inch. Joseph Obbard, River Surveyor, Salween S.V., off Calcutta, December 1860. T. Black & Co., Lithrs. Engrs., Calcutta.
As Surveyed in October 1860. Scale a thousand yards to an inch. Joseph Obbard, River Surveyor, Salween S.V., off Calcutta, 21st November 1860. T. Black & Co., Lithrs: & Engrs:, Cal:.
As Surveyed in November 1861. Scale of a Thousand Yards to the Inch. Joseph Obbard, River Surveyor, Salween S.V., off Kedgeree, 28th November 1861. T. Black & Co., Lithrs: & Engrs:, Cal:.
As Surveyed in November 1858, and corrected and enlarged in January 1864, to include the New mouth of the Mahanuddee which formed in November 1863. Scale One thousand Yards to the Inch. Joseph Obbard, River Surveyor. T. Black & Co., Lithrs:, Calcutta.
As Surveyed in January 1863. Scale A thousand Yards to the inch. Joseph Obbard, River Surveyor, Salween S.V., off Kedgeree, 27th January 1863. T. Black & Co., Lithrs: & Engrs:, Cal:. Annotated by Barlow.
Surveyed December 1865. Scale 1000 Yards to an Inch. F. Laycock, Offg. River Surveyor, Fame R.S.V., off Diamond Harbour, January 3rd 1866. Litho: W. B. Nyss, 47 Dhurrumtollah Road. Manuscript additions and extension slip by Barlow.
29 The Rangafulla, Mud Point And New Jellingham Channels.
Scope & Content:
Surveyed August and September 1867. Scale 1000 Yards to an Inch. F. Laycock, River Surveyor, Fame R.S.V., Mud Point Channel, September 10th 1867. Bengal Litho: Press, No. 47 Dhurrumtollah Road, Calcutta. Formerly numbered 48. Annotated by Barlow.