Krefting, Denise. "Images of Historic Iowa Maps 1687- 1863". OER Commons. Institute for the Study of Knowledge Management in Education, 11 Apr. 2017. Web. 20 Dec. 2024. <https://oercommons.org/authoring/21395-images-of-historic-iowa-maps-1687-1863>.
Krefting, D. (2017, April 11). Images of Historic Iowa Maps 1687- 1863. OER Commons. Retrieved December 20, 2024, from https://oercommons.org/authoring/21395-images-of-historic-iowa-maps-1687-1863.