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.
Sketch Of The West Coast Of Andaman. Capt. James Gray Wragg in the Ship Dolphin, 1771. [Scale of] Nautic Miles [approximately 1:1,500,000.] Inset: View Of The Great Andaman. With the Soundings in the Lord Mansfield, by Capt. Alexr. McCleod, 1764. [No scale given.] A. Dalrymple, 18 December 1784.