Botting, Douglas. Humboldt and the cosmos. - London : Joseph, 1973. Includes index. Bibliography: p. 285-286. ISBN: 0718111370 LCCN: 74163783 Subjects--Personal Names: Humboldt, Alexander von, 1769-1859. Humboldt, Alexander von, 1769-1859. LC Class. No.: Q143.H9 / B67 1973 Dewey Class. No.: 500.9/2/4 B