Sketch map to illustrate the journey of Hanns Vischer across the Sahara from Tripoli to Lake Chad / Geographical Journal, the Royal Geographical Society.Royal Geographical Society (Great Britain)1909Includes 1 ancillary location map.Map accompanies article in the March, 1909 Geographical Journal: "A journey from Tripoli across the Sahara to Lake Chad," by Hanns Vischer.Relief shown by shading.cartographic