Historical Dictionary of Ethiopia - Thomas P. Ofcansky, David H. Shinn - Google Books

http://books.google.de/books?id=ep7__RWqq4IC

Ethiopia is one of the world's oldest countries; its Rift Valley may be the location where the ancestors of humankind originated more than four million years ago. With a population of 67 million people today, it is the third most populous country on the…