South American savannas : comparative studies of Colombia and Guyana /
by T.A. Wymstra and T. van der Hammen.-
- Montreal : McGill University, Department of Geography, 1967.
- 71-90 p. ill., maps, plates
- (McGill University Savanna research project. Savanna research series ; no. 6). .
Reprinted from: Leidse geologische mededelingen, v. 38, 1966.