A Survey Of Negrais Harbour […] And Plan Of The Entrance Of Persaim River. Thomas Taylor, 1753 [and] Capt. George Baker. Scale of Nautuc Miles [approximately 1:180,000.] A. Dalrymple, 25 November 1774.
Sketch Of Negrais And The Adjacent Parts. Capt. James Gray Wragg. [Scale of latitude approximately 1:730,000.] Inset: Track Of The Nassau Thro' The Cocos Islands. Mr. William Greer, 1779. [Scale of latitude approximately 1:730,000.] A. Dalrymple, 27 November 1784.
A Chart Of The River Of Persaim. Capt. George Baker. With some Additions from a Chart by Alexander Sibbald, 1751. Scale of Nautic Miles [approximately 1:180,000.] A. Dalrymple, 25 February 1775.
Chart Of The Passage Between Negrais And The Andaman. Alexander Sibbald, 175[ ]. [Scale of latitude approximately 1:1,500,000.] A. Dalrymple, 1 November 1784.
Chart From Negrais To The Island Carnicobar. John Ritchie, 1771. [Scale of latitude approximately 1:1,500,000.] Inset views. A. Dalrymple, 4 November 1784.
Chart Of The Andaman Islands. John Ritchie, 1771. From the MS. at the East India House. [Scale of latitude approximately 1:730,000.] A. Dalrymple, 13 January 1785.