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.