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:.
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.
39 The James and Mary's and Adjacent Channels as Surveyed in April 1857.
Scope & Content:
Scale One Thousand feet to an Inch. Joseph Obbard, River Surveyor, H.C.S.V. Cavery, off Calcutta, 6th May 1857. T. Black, Lithr:, 4 Waterloo Street, Calcutta.
25 A Sketch Of The Upper Part Of The Gaspar & The Lower Bar Of Thornhill's Channel.
Scope & Content:
Surveyed in Feby. 1855. Scale 1000 Yards to an Inch. Benjn. Bensley, River Surveyor, Feby. 27th 1855. Drawn on transfer paper & Lithographed at the Asiatic Lithc. Press, T. Black, Lithographer, 5/3 Tank Square. Annotated by Barlow.