Envisaging the West: Thomas Jefferson and the Roots of Lewis and Clark



Rittenhouse, David

David Rittenhouse to Thomas Jefferson, April 10, 1793 David Rittenhouse asks Thomas Jefferson for direction in the planning of the Andrew Michaux expedition.

Thomas Jefferson to David Rittenhouse, April 11, 1793 Thomas Jefferson responds to David Rittenhouse's April 10 inquiry about planning Michaux's expedition and desires that the Philosophical Society meet.

Thomas Jefferson to Jonathan Williams, July 3, 1796 Thomas Jefferson discusses "barometrical measurements" of the Virginia mountains. Jefferson also notes his ongoing interest in agricultural researches.