DONKIN, Rufane Shaw (1773-1841). A Dissertation on the Course and Probable Termination of the Niger. London: J. Murray, 1829. 8°. 3 folding engraved maps. Original boards (spine chipped at head, lower joints slightly split). PRESENTATION COPY with title inscribed: 'The Earl of Eldon from the Author'. ONLY EDITION of this remarkable piece of geographical guesswork by one of the original fellows of the R.G.S.