When the Corps of Discovery left the vicinity of St. Louis in 1804
to explore the American West, they had only sketchy knowledge of
the terrain that they were to cross—existing maps often contained
large blank spaces and wild inaccuracies. William Clark
painstakingly mapped every mile of the journey, drawing from
both direct observation and from the reports of Indians and a
few fur traders. On their return Lewis and Clark directed the
execution of new maps detailing with remarkable accuracy the
features of the country that they had traversed.
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