by Alexander von Humboldt
by Alexander von Humboldt
by Alexander von Humboldt
by Alexander von Humboldt
by Aimé Bonpland, Alexander von Humboldt
by Enrique Molina
by Aimé Bonpland, Alexander von Humboldt
by Aimé Bonpland, Alexander von Humboldt
by Theodore Roosevelt
by Alexander von Humboldt
by Robert Fitzroy, Philip Parker King
by Alexander von Humboldt
by Alexander von Humboldt
by Harry Alverson Franck
by Annie S. (Annie Smith) Peck
by Georges Clemenceau
by Harry Alverson Franck
by Hiram Bingham
by George Whitfield Ray
by Henry Stephens
by Viscount James Bryce Bryce
by Maturin M. (Maturin Murray) Ballou
by Gaston Lemay
by Leo E. (Leo Edward) Miller
by Walter Colton
by Friedrich Gerstäcker
by Harry Weston Van Dyke
by Reginaldo de Lizárraga
by Reginaldo de Lizárraga
by Freiherr von Ernst Bibra
by Freiherr von Ernst Bibra
by Gorgonio Petano y Mazariegos
by Jules Crevaux
by Oskar von Riesemann
by A. S. (Archibald Stevenson) Forrest
by John Ball
by Colin Ross
by D.D. James Thomson