Dolan, Edward F. Green universe the story of Alexander von Humboldt. - New York Dodd, Mead [1959] - 244 p. illus. 21 cm. LCCN: 59012739 Subjects--Personal Names: Humboldt, Alexander von 1769-1859. LC Class. No.: Q143.H9 / D6 Dewey Class. No.: 925