After painstakingly mapping every mile of the journey, drawing from both direct observation and from the reports of Indians and a few fur traders Lewis and Clark directed the execution of new maps detailing with remarkable accuracy the features of the country that they had traversed.
`[The introduction is] the definitive work on the cartography of the Lewis and Clark expedition....[The maps] are beautifully arranged and organized with a clarity of reproduction that would be difficult to match.' Great Plains Quarterly