Sources of the River
Tracking David Thompson across western North America
By Jack Nisbet

Epic Wanderer
David Thompson and the mapping of the Canadian West
By D'arcy Jenish

Great Surveys of the American West
By Richard A. Bartlett

The Lewis and Clark Journals
University of Nebraska Press Edited by Gary Moulton

Last edited by Malloy805; 06/29/11.
" He who refuses to do the arithmetic is doomed to talk nonsense" John McCarthy