I recently learned about the book "Beyond Timbuktu" http://www.hup.harvard.edu/catalog.php?isbn=9780674050822 http://www.hup.harvard.edu/catalog.php?isbn=978067

I recently learned about the book "Beyond Timbuktu" http://www.hup.harvard.edu/catalog.php?isbn=9780674050822 http://www.hup.harvard.edu/catalog.php?isbn=9780674050822 but still haven't read it. It seems a good introduction to the subject.