Highly detailed map of North America, issued shortly before the publication of the official account of Lewis & Clark's expedition to the Pacific Ocean.
The map shows a very primitive knowledge of the western US, with no sign of the mythical rivers which would dominate Western Cartography for the next 25 years. Massive Louisiana Territory shown, shortly after the Louisiana Purchase. Some knowledge of the Missouri River is shown, but its course westward toward the Rocky Mountains is not yet known. The treatment of the Rocky Mountains as a single Cordillera pre-dates the style popularized by Humboldt.
The charm of the map is that it truly demonstrates the blank canvass upon which manifest destiny would paint the history of the American Frontier over the next 75 years.