HUMBOLDT, Alexander de & Aimé BONPLAND. Personal Narrative of Travels to the Equinoctial Regions of the New Continent, during the years 1799-1804 ... translated into English by Helen Maria Williams, London: Longman, 1818-29, vols. I-VII in 6, 8°, 8 lithographed maps and plans (some browning), later blue half morocco. [cf. Cox II, p.288] (6)