by Cyrus Townsend Brady
by Aimé Bonpland , Alexander von Humboldt
by Aimé Bonpland , Alexander von Humboldt
by Aimé Bonpland , Alexander von Humboldt
by Arnold Henry Savage Landor
by Charles Waterton
by George Whitfield Ray
by R. M. (Robert Michael) Ballantyne
by Charles Darwin