John Hanning Speke 
What Led to the Discovery of the Source of the Nile [PDF ebook] 

John Hanning Speke writes about the history of his first two explorations in Africa that led to the discovery of the source of the Nile. The manner in which he traced the Nile down from the Victoria N’yanza, which is the great source or reservoir of the Nile, to Egypt is explained in this book.