Additional Resources
- Spirit Mound Historic Prairie
- National Park Service - Spirit Mound Info
- Spirit Mound on the National Register of Historic Places
- Textual Documents for the National Register of Historic Places
- Missouri National Recreation River
- Adams Homestead and Nature Preserve
- W.H. Over Museum in Vermillion, SD
- Missouri National Recreational River Water Trail
- Clay County Historical Society
- Historical Account of Spirit Mound after 1806