THOMSON, John United States and Additions. Edinburgh, 1820 [but watermarked 1821].Hand-colored engraved map of the United States, im age 503 x 594 mm (540 x 709 mm sheet). (Light toning to margins and center fold.) Thomson's map depicts Florida, which had been recently purchased from the Spanish in 1819. It also includes Michigan Territory, the North West Territory east of the Missisippi, and the Missouri Territory west of the Mississippi. Wheat Transmississippi 340.