[Map of South Africa showing the route of the expedition of 1790-91, drawn for C.J. van der Graaff]
Van der Graaff, J. C.
[Johannesburg :  Witwatersrand University Press, 
1958]
In: Jacob Von Reenen and the "Grosvenor" Expedition of 1790-1791. By Percival R. Kirby. Map 2.