1"2020 Iowa Pork Industry Facts." Iowa Pork Producers Association. Accessed: February 25, 2021.
2"8 Iowa Inventions." Courier, July 19, 2018. Accessed: February 27, 2021.
3"American Gothic House and Center." Accessed: February 25, 2021.
4"Arabella Mansfield." Iowa Department of Human Rights. Accessed: February 25, 2021.
5Coulter, John. "Fairfield, Iowa: Golden Dome of Pure Knowledge." Roadside America. January 1, 1997. Accessed: February 25, 2021.
6"General Information - RAGBRAI." RAGBRAI. Accessed: February 27, 2021.
7Hanson, Carol Carpenter. "Tracing John Wayne’s Iowa Roots: Iconic Actor Lived in Winterset, Earlham, Des Moines, Keokuk and Brooklyn." Iowa History Journal. Accessed: February 25, 2020.
8"Hobo Museum. Britt Hobo Days. Accessed: February 28, 2021.
9Honey, Rex D. "Iowa." Brittanica. Updated May 13, 2021. Accessed: February 25, 2021.
10"Ice Cream Capital of the World." Wells Enterprises, Inc. Accessed: February 27, 2021.
11"Iowa Ag News – 2019 Crop Production." United States Department of Agriculture, January 10, 2020. Accessed: February 27, 2021.
12Lefevers, Delana. "This Island in Iowa Is an Absolute Must Visit." Only in Your State. May 4, 2016. Accessed: February 28, 2021.
13Magaraci, Kim. "The World’s Largest Grotto Is Located in Iowa and You’ve Got to Visit." Only in Your State. May 14, 2018. Accessed: February 25, 2021.
14Prostine, Ben. "Searching for the Meaning of Iowa: Word Roots, Prairie Roots (Blog)." Patch.com, February 21, 2012. Accessed: February 27, 2021.
15Schwieder, Dorothy. Iowa: The Middle Land. Iowa City: University of Iowa Press (1996).
16Whittaker, William E., Lynn M. Alex, and Mary C. De La Garza. The Archaeological Guide to Iowa. Iowa City: University of Iowa Press (2015).
17"Wind energy." Iowa Environmental Council. Accessed: February 27, 2021.