Hill Prairies of Illinois. Illinois Natural History Survey Bulletin, Champaign, IL, v. 26, n. 1-6, p. 367–446, 1955. DOI: 10.21900/j.inhs.v26.180. Disponível em: https://iopn.library.illinois.edu/journals/inhs/article/view/180.. Acesso em: 7 may. 2024.