Al Azharia Jahn S. Traditional methods of water purification in the riverain Sudan in relation to geographic and socio-economic conditions. ERDKUNDE [Internet]. 1977 Jun. 30 [cited 2024 Dec. 11];31(2):120-3. Available from: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/1816