- Petermann, August Heinrich
- University of Illinois at Urbana-Champaign, University Library
24.7 x 42.7 cm. 1:2,500,000. Relief shown by contours, hachures and spot heights. Explorers' routes indicated by color or dashed lines. Printed color.
- Rohlf, Gerhard, 1831-1896--Travel--Nigeria
Nigeria--Discovery and exploration, European
Discovery Explorer routes
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