Prevention and Mitigation of Urban Gullies: Lessons learned from Failures and Successes von Vanmaercke, Matthias, Imwangana, Fils Makanzu, Cogels, Serge, Dewitte, Olivier, Trefon, Theodore, Bielders, Charles, Poesen, Jean, Nandefo, Robert Wa, Lawunda, Willy Mbalanda

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