"The Journey Begins". Lewis & Clark Interactive Journey Log. National Geographic. Archived from the original on February 17, 2011. Retrieved October 5, 2010.
nps.gov
"Introduction". Lewis and Clark Expedition: A National Register of Historic Places Travel Itinerary. U.S. National Park Service. Archived from the original on May 20, 2012. Retrieved October 5, 2010.
"The Missouri River Story". Columbia Environmental Research Center. U.S. Geological Survey. Archived from the original on 27 May 2010. Retrieved 2010-04-10.
"Missouri River". Columbia Environmental Research Center. U.S. Geological Survey. September 8, 2009. Archived from the original on May 20, 2012. Retrieved May 10, 2010.
"The Missouri River Story". Columbia Environmental Research Center. U.S. Geological Survey. Archived from the original on 27 May 2010. Retrieved 2010-04-10.
Crane, Gabe (2007). "Wyoming Metropolis?". Next American City. Archived from the original on December 11, 2010. Retrieved January 17, 2012.
"The Journey Begins". Lewis & Clark Interactive Journey Log. National Geographic. Archived from the original on February 17, 2011. Retrieved October 5, 2010.
webcitation.org
"Missouri River". Columbia Environmental Research Center. U.S. Geological Survey. September 8, 2009. Archived from the original on May 20, 2012. Retrieved May 10, 2010.
"North America". Encyclopædia Britannica. Archived from the original on May 20, 2012. Retrieved May 10, 2010.
"Introduction". Lewis and Clark Expedition: A National Register of Historic Places Travel Itinerary. U.S. National Park Service. Archived from the original on May 20, 2012. Retrieved October 5, 2010.