Conard, Rebecca (1998). "Convergence". Tallgrass Prairie National Preserve Legislative History, 1920–1996. National Park Service. Archived from the original on June 15, 2019. Retrieved April 2, 2021.
"Listing of Acreage (Summary)"(PDF). NPS Stats. National Park Service. December 31, 2020. Archived(PDF) from the original on January 13, 2021. Retrieved January 25, 2021.
Conard, Rebecca (1998). "Convergence". Tallgrass Prairie National Preserve Legislative History, 1920–1996. National Park Service. Archived from the original on June 15, 2019. Retrieved April 2, 2021.
"Listing of Acreage (Summary)"(PDF). NPS Stats. National Park Service. December 31, 2020. Archived(PDF) from the original on January 13, 2021. Retrieved January 25, 2021.
"Stats Report Viewer". National Park Service. Archived from the original on July 13, 2015. Retrieved April 18, 2019.