HUNTER, J. TOESPRAAK : SIMPOSIUM : LUGBESOEDELING - UITDAGINGS IN SUIDELIKE AFRIKA • 26 NOVEMBER 1986 : W N N R KONFERENSIESENTRUM PRETORIA. Clean Air Journal, [S. l.], v. 7, n. 2, p. 3–6, 1986. DOI: 10.17159/caj/1986/7/2.7350. Disponível em: https://cleanairjournal.org.za/article/view/7350. Acesso em: 7 may. 2024.