by Gerhard Rohlfs
by Victor Barrucand, Isabelle Eberhardt
by James Richardson
by Gerhard Rohlfs
by Hugh Clapperton, Dixon Denham, Walter Oudney
by James Richardson
by Isabelle Eberhardt
by M. F. (Milburg Francisco) Mansfield
by Gerhard Rohlfs
by George Edward Woodberry
by Gerhard Rohlfs