Checking through our catalog at the Queens Borough Public Library, there is
a listing of these two titles that might be useful on this topic.
Riefenstahl, Leni. *The last of the Nuba*. 1st U.S ed. New York: Harper
& Row. 1974. 208p (ill).
Riefenstahl, Leni. *The People of Kau*. New York: Harper & Row. 1976.
224p (ill).
If I come across anything else I will keep you posted. Good luck.