BARRY, R. G. The punched card and its application in geographical research. ERDKUNDE, [S. l.], v. 15, n. 2, p. 140–142, 1961. DOI: 10.3112/erdkunde.1961.02.06. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/1343. Acesso em: 8 oct. 2024.