AL AZHARIA JAHN, S. Traditional methods of water purification in the riverain Sudan in relation to geographic and socio-economic conditions. ERDKUNDE, [S. l.], v. 31, n. 2, p. 120–130, 1977. DOI: 10.3112/erdkunde.1977.02.05. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/1816. Acesso em: 8 oct. 2024.