- Hassenstein, Bruno; Debes, E
- University of Illinois at Urbana-Champaign, University Library
24.0 x 19.0 cm. 1:2,000,000. Includes 1 inset map (scale 1:1,000,000): Der Ogowai. Explorer's routes indicated by colored lines. Hand colored. Lithography.
Gabon--Discovery and exploration, European
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