- Petermann, August Heinrich
- University of Illinois at Urbana-Champaign, University Library
43.0 x 24.0 cm. 1:2,000,000. Relief shown by hachures. Petherick's route indicated in red. Hand colored. Lithography.
Nile River Watershed--Discovery and exploration, British
Petherick, John, 1813-1882--Travel--Sudan
Discovery Explorer routes
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