Discovering Lewis and Clark. Lewis-Clark.org, A Jefferson Peace Medal http://www.lewis-clark.org/FTCLVIRTUAL/an_jeffmed.htm#note3u

Good summary of the Jefferson Peace Medal.

PBS(Online), Lewis and Clark: The Native Americans. http://www.pbs.org/lewisandclark/native/index.html

An interactive map illustrating where various tribes were encountered which you can explore to find out more about the tribes themselves.

The Journals of Lewis and Clark, In the Footsteps of Lewis and Clark. http://www.sierraclub.org/lewisandclark/journal/

Chronologically catalogued journals entries of Meriwether Lewis and William Clark.

The Journals of the Lewis and Clark, Lewis and Clark as Plains Ethnographers http://lewisandclarkjournals.unl.edu/ronda_plainsethno.html

Research on the culture and customs of different tribes the Lewis and Clark Corps met during their journey.

The Lewis and Clark Journey of Discovery, Corps Of Discovery- Preparing for the Trip West http://www.nps.gov/jeff/LewisClark2/CorpsOfDiscovery/Preparing/PeaceMe...

A good description of Peace Medals with a table of when they were distributed on The Lewis and Clark Expedition.