PROEHL, K. Teaching United States History With The Great American History Machine. Cartographic Perspectives, [S. l.], n. 02, p. 19, 1989. DOI: 10.14714/CP02.1171. Disponível em: https://cartographicperspectives.org/index.php/journal/article/view/cp02-proehl. Acesso em: 27 apr. 2024.