Sahara and Sudan 
Nachtigal, Gustav.
Fisher, Allan George Barnard.
Fisher, Humphrey John.
O'Fahey, Rex Seán.
London C. Hurst,
1971
Originally published in 3 vols as 'Sahara und Sudan'. - Vols 1 and 2 originally published, Berlin: Weidmannsche Buchhandlung, 1879-1881. Vol.3 originally published, Leipzig: F.A. Brockhaus, 1889
Includes index