1783. Ritchie, John, active 1771-1814 and Robert Sayer and John Bennett (Firm). Cartographic Details: Scale approximately 1:1,100,000 (E 93°10'00"--E 98°35'00"/N 21°00'00"--N 13°30'00"). Relief shown pictorially. Depths shown b... Robert Sayer and John Bennet ; London.
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1794. Plaisted, Bartholomew, -1767 and Ritchie, John, active 1771-1814. Cartographic Details: Scale approximately 1:880,000 (E 85°50'00"--E 93°15'00"/N 23°30'00"--N 19°10'00"). Depth shown by soundings. Inset: Chittigon... Laurie & Whittle; London.