Bruhns, Carl, ed. Life of Alexander von Humboldt. Compiled in Commemoration of the Centenary of His Birth by J. Löwenberg, Robert Avé-Lallemant, and Alfred Dove. Edited by Professor Karl Bruhns ... Translated from the German by Jane and Caroline Lassell ... London: Longmans, Green; Boston and New York: Lee and Shepard, 1873. 2 vols.