Surveyed in April 1851. Scale of 1000 Yards to an Inch. A. Bedford, River Surveyor, Calcutta, May 12th 1851. Lithographed & Sold by T. Black, Asiatic Lithographic Press, Calcutta.
Surveyed in August 1852. Scale of 1,000 yards to an Inch. Arthur Bedford, River Surveyor, Mud Point, August 12th 1852, Beacon Sg. Vessel. Lithographed.
Scale 1000 Yds to an inch. Surveyed in August 1855. Benjn. Bensley, River Surveyor, August 19th 1855. Drawn on transfer paper & lithographed at The Asiatic Lith: Press, No. 4, Waterloo Street, running along from the N.E. corner of Govt. House.
As surveyed in August 1863. Scale a thousand Yards to the Inch. Joseph Obbard, River Surveyor, Salween S.V., off Calcutta, 21st August [18]63. Lithographed.
3 The Mud Point, Auckland, Dredge, And Bedford Channels.
Scope & Content:
As surveyed in August 1863. Scale One Thousand Yards to the Inch. Joseph Obbard, River Surveyor, Salween S.V., off Calcutta, 21st August 1863. T. Black & Co., Lithrs: & Engrs:, Calcutta. Annotated by Barlow.
As surveyed in February 1864. Scale One Thousand yards to the inch. Joseph Obbard, River Surveyor, Salween S.V., off Calcutta, 26th February 1864. T. Black & Co., Lithrs: Engrs: Calcutta.
Surveyed January 1869. Scale 2000 Yards to an Inch. F. Laycock, River Surveyor, Fame R.S.V., February 12th 1869. Lith: by W. B. Nyss, 133 Durrumtollah Road, Calcutta, 1869. Annotated by Barlow.
49 The New Rangafulla, Mud Point And Jellingham Channels.
Scope & Content:
Surveyed December 1873. Scale 1000 yards to an Inch. F. Laycock, River Surveyor, Megna R.S.V., December 15th 1873. Photozincographed under the Superintendence of Captn. J. Waterhouse, Surveyor General's Office, Calcutta. Formerly numbered 53. Manuscript additions and annotations by Barlow.