Narrative of Travels and Discoveries in Northern and Central Africa, in the Years 1822,1823, and 1824, by Major Denham, Captain Clapperton, and the Late Doctor Oudney, Extending Across the Great Desert to the Tenth Degree of Northern Latitude ... with an Appendix, Published by Authority of the Right Honourable Earl Bathurst ... by Major Dixon Denham ... and Captain Hugh Clapperton, of the Royal Navy ..