WROBEL, David M. The Closing Gates of Democracy: Frontier Anxiety Before the Official End of the Frontier. American Studies, [S. l.], v. 32, n. 1, p. 49–66, 1991. DOI: 10.1353/amsj.v32i1.2892. Disponível em: https://journals.ku.edu/amsj/article/view/2892.. Acesso em: 3 may. 2024.