TROLL, C. Das Alexander -v.Humboldt-/Carl-Ritter-Gedächtnisjahr 1959. ERDKUNDE, [S. l.], v. 13, n. 1, p. 1–5, 1959. DOI: 10.3112/erdkunde.1959.01.01. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/1263. Acesso em: 7 oct. 2024.