At other times he depicted maps of the same area from several authors together in one supplement map to show the authors' different interpretations. This was the case with, for example, the map of the Kerguelen and McDonald Islands sighted by John Heard (1853), William MacDonald (1854), Hutton (1854), Attway (1854), Rees (1854), and Neumayer (1857), with several comparisons of explorations since James Cook. The same with small maps (scale ca. 1:33,000,000) of the central part of southern Africa, which shows different interpretations by Heinrich Kiepert (1855), J. McQueen (1857) and David Livingstone (1857). Or with the representation of the Gabon countries, which show interpretations by August Petermann, Thomas E. Bowdich, William D. Cooley, Heinrich Kiepert, Paul Belloni du Chaillu and Heinrich Barth.