Lewis and Clark Project Documents
Smithsonian National Museum of Natural History: Lewis and Clark as Naturalists
National Geographic: Lewis and Clark
USGS: Winter on the Missouri near Fort Mandan
http://www.usmint.gov/kids/coinNews/wjNickelSeries/
http://www.harcourtschool.com/activity/types_of_land_2/
http://www.lewis-clark.org/content/content-channel.asp?ChannelID=256
USGS: A Satellite View of the Journey of Lewis and Clark http://eros.usgs.gov/LewisandClark/