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.
33 The Rangafulla, Jellingham, And Mud Point Channels.
Scope & Content:
Surveyed December 1868. Scale 1000 yards to an inch. F. Laycock, River Surveyor, Fame R.S.V., December 22nd 1868. Lithographed. Formerly numbered 49. Manuscript additions and annotations by Barlow.
Surveyed February & March 1874. Scale 2000 Yards to an Inch. F. Laycock, River Surveyor, Megna R.S.V., March 12th 1874. Photozincographed under the Superintendence of Captn. J. Waterhouse, Surveyor General's Office, Calcutta. The Entrance Of The River Hooghly From The Eastern Channel Ligh...
Surveyed January & February 1877. Scale 2000 Yards = 1 Inch. F. Laycock, River Surveyor, Kedgeree R.S.V., February 23rd 1877. Photozincographed under the Superintendence of Captn. J. Waterhouse, Surveyor General's Office, Calcutta. Manuscript additions and annotations by Barlow.
Surveyed November and December 1878. Scale 1000 Yards = 1 Inch. F. Laycock, River Surveyor, Clyde R.S.V., January 2nd 1879. Photozincographed at the Surveyor General's Office, Calcutta. Manuscript additions and annotations by Barlow.
Surveyed January & February 1879. Scale 2000 Yards to an Inch. F. Laycock, River Surveyor, Clyde R.S.V., February 20th 1879. Photozincographed at the Surveyor General's Office, Calcutta, February 1879. Manuscript additions and annotations by Barlow.