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| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Cameroon's Tycoon: Max Esser's Expedition and Its Consequences | 978-1-57181-988-8 (1-57181-988-6) | 2002 | Max Esser · Ute Roschenthaler |
| Zintgraff's Explorations in Bamenda, Adamawa and the Benue Lands 1889-1892 | 978-9956-616-71-8 (9956-616-71-0) | 2010 | |