"Langhans: Beiträge zur Kenntnis der deutschen Schutzgebiete, Nr. 18.", "Petermann's geographische Mitteilungen. Jahrgang 1902, Tafel 7.", Includes inset: Alexander Ross' eigene Karte., and Relief shown by hachures.
Publisher:
Justus Perthes,
Subject (Geographic):
Cameroon--Discovery and exploration--Maps
Subject (Name):
Justus Perthes (Firm : Gotha, Germany) and Ross, Alexander--Travel--Maps