Conservation of vegetation in Africa South of the Sahara : proceedings of a symposium held at the 6th Plenary meeting of the Association pour l'Etude Taxonomique de la Flore d'Afrique Tropicale (A.E.T.F.A.T.) in Uppsala, Sept. 12-16, 1966 - Adam, J. G. (Almqvist & Wiksells Boktryckeri AB, 1968)