My task was to learn about the expedition of Lewis and Clark. So I've started from Wikipedia, were you can usually find the most reliable and objective information. Except some general facts I've traced there a famous map of expedition.It was interesting to know that it changed mapping of northwest America by providing the first accurate depiction of the relationship of the sources of the Columbia and Missouri rivers, and the Rocky Mountains!
http://en.wikipedia.org/wiki/Lewis_and_Clark_Expedition
Here(
http://www.pbs.org/lewisandclark/archive/idx_map.html) I've found some thumbnail images of several maps related to the journey of the Corps of Discovery.This is the one I liked the most:
It was made by William Clark!
I've found here lots of information about about expedition! The most I liked to read the article named "Close Call at the Falls"
