Hi ,
some good books to read on SA-treasures are:
The Hinges Creaked by Eric Rosenthal (1951)
The seven lost trails of Africa by Hedley A. Chilvers ( 1930)
Somthing Rich and Srange by Lawrence G. Green. (1962)
All three have the well known storys about land and underwater treasures.
A Calbash of Diamonds (An African Treasure Hunt ) by Margaret Lane (1961)
Skeleton Coast by John H. Marsh (1944) About a wreck at the Kaokoveld Coast.
Have a look at abebooks.com
If all that "internet-stuff" doesn`t help you can contact me at :bigarchy2003@yahoo.com
regards
grantler