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 August & September 1859. Scale one thousand yards to the inch. Joseph Obbard, River Surveyor, H.M.S.V. Spy, off Calcutta, 19th Sept. 1859. T. Black & Co., 4 Waterloo St., Cal:.
51 A Sketch Of The Upper Part Of The Rangafulla Channel.
Scope & Content:
Surveyed in November 1859. No scale given. Joseph Obbard, River Surveyor, H.M.S.V. Spy, off Kedgeree, 12th Novr. 1859. T. Black & Co., 4 Waterloo St., Cal:.
As surveyed in November & December 1859 & January 1860. Scale 2000 yards to an inch. Joseph Obbard, River Surveyor, Salween R.S.V., 17th March 1860. T. Black & Co., Lith:, 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 1860. Scale of a thousand yards to the Inch. Joseph Obbard, River Surveyor, Salween S.V., off Calcutta, Decr. 4th 1860. T. Black & Co., Lithrs: Engrs:, Cal:.
56 The Gasper And Thornhills' Channels And The Reef Head Passage.
Scope & Content:
As surveyed in December 1860 and January 1861. Scale One Thousand Yards to the Inch. Joseph Obbard, River Surveyor, Salween S.V., off Calcutta, 17th Feby. 1861. T. Black & Co., Lithrs: & Engravers, Calcutta.
57 The Outer And Middle Rangafulla Channels And The Mud Point Anchorage.
Scope & Content:
As surveyed in May 1861. Scale One thousand Yards to an Inch. Joseph Obbard, River Surveyor, Salween S.V., off Calcutta, 1st June 1861. T. Black & Co., Calcutta, Lithographers & Engravers.
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:.