TROLL, C. Zum Geleit. ERDKUNDE, [S. l.], v. 1, n. 1, p. 1–2, 1947. DOI: 10.3112/erdkunde.1947.01.01. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/844. Acesso em: 2 dec. 2024.