4to (265 x 205 mm). With folding engraved frontispiece map and 13 engraved plates (one hand-colored). (Folding map with slight offsetting and a few short tears to fold, some repaired verso, a few leaves with discreet marginal repairs). Modern half calf.FIRST EDITION. The introduction contains a copy of Tuckey's instructions and a critical survey of discovery and exploration of the Nile, Niger, and Congo or Zaire River. A CLEAN COPY.