Letters of Alexander von Humboldt to Varnhagen von Ense. From 1827 to 1858. With extracts from Varnhagen's diaries, and letters of Varnhagen and others to Humboldt - Humboldt, Alexander von, 1769-1859; Varnhagen von Ense, Karl August, 1785-1858 [Contributor]; Assing, Ludmilla, 1821-1880 [Editor]; Kapp, Friedrich, 1824-1884 [Translator]