"Bicentennial Lewis & Clark Expedition Issue", Arago: people, postage & the post, National Postal Museum online, viewed April 28, 2014. An image of the stamps can be seen at Arago online, 37c Lewis and Clark on Hill stampArchived April 29, 2014, at the Wayback Machine.
"Bicentennial Lewis & Clark Expedition Issue", Arago: people, postage & the post, National Postal Museum online, viewed April 28, 2014. An image of the stamps can be seen at Arago online, 37c Lewis and Clark on Hill stampArchived April 29, 2014, at the Wayback Machine.
"Inductees". St. Louis Walk of Fame. Archived from the original on October 31, 2012. Retrieved April 25, 2013.
"Hall of Great Westerners". National Cowboy & Western Heritage Museum. Archived from the original on April 19, 2019. Retrieved November 21, 2019.