The Southern Sudan in Historical Perspective - Robert O. Collins - Google Books

https://books.google.de/books?id=9dDxtIVy-24C

Robert O. Collins is one of the most prolific authors on Africa, the Sudan, and the Nile. The Southern Sudan in Historical Perspective, based on a seriesof lectures he gave in 1973 to the Department of Middle Eastern and AfricanHistory and the Shiloah…