Samuel Lewis, Samuel Harrison and William Clark's Map

Photo: Library of Congress 

William Clark’s famous map of the Louisiana Territory from the Mississippi River to the Pacific Ocean was published in 1814 as part of the original Biddle/Allen journals.

It was a team effort, however. Clark completed his detailed drawing of the map in 1810 and turned over the work to be copied and “cleaned up” by Samuel Lewis, a mapmaker from Philadelphia. Lewis then turned over the work to Samuel Harrison, an engraver who prepared the map for publication. Both Lewis and Harrison are credited on the map’s title panel.