Quotes from:
Colorado, A History of the Centennial State
by Abbot/Leonard/McComb
A Colorado History by Ubbelohde/Benson/Smith
Bury My Heart At Wounded Knee by Dee Brown
The Rockies by David Lavender
The American Heritage Book of Indians
Other sources:
Mountain Men and Fur Traders of the Far West
edited by Leroy Hafen
The Readers Encyclopedia of the American West
edited by Howard Lamar
Encyclopedia Britannica
Bent's Fort by David Lavender