. . "Letters of Alexander von Humboldt : written between the years 1827 and 1858, to Varnhagen von Ense ; together with extracts from Varnhagen's diaries, and letters from Varnhagen and others to Humboldt : authorized translation from the German, with explanatory notes and full index of names"@en . . . "Letters of Alexander von Humboldt written between the years 1827 and 1858, to Varnhagen von Ense" . . "Letters of Alexander von Humboldt : written between the years 1827 and 1858, to Varnhagen von Ense : together with extracts from Varnhagen's diaries, and letters from Varnhagen and others to Humboldt" . "Letters of alexander von humboldt written between the years 1827 and 1858 to varnhagen von ense"@en . . "Letters of Alexander von Humboldt written between the years 1827 and 1858 to Varnhagen von Ense together with extracts from Varnhagen's diaries, and letters of Varnhagen and others to Humboldt" . "Letters of Alexander von Humboldt written between the years 1827 and 1858 to Varnhagen von Ense together with extracts from Varnhagen's diaries, and letters of Varnhagen and others to Humboldt"@en . "Diaries" . "Diaries"@en . . . . . . . . . . . "Letters of Alexander von Humboldt Written between the Years 1827 and 1858, to Varnhagen von Ense; Together with Extracts from Varnhagen's Diaries, and Letters from Varnhagen and Others to Humboldt"@en . "Records and correspondence"@en . . . . . "Records and correspondence" . "Letters of Alexander von Humboldt : written between the years 1827 and 1858 to Varnhagen von Ense" . . . . "Letters of Alexander von Humboldt written between the years 1827 and 1858, to Varnhagen von Ense : together with extracts from Varnhagen's diaries, and letters from Varnhagen and others to Humboldt"@en . . "Letters of Alexander von Humboldt written between the years 1827 and 1858 to Varnhagen von Ense : together with extracts from Varnhagen's diaries, and letters of Varnhagen and others to Humboldt" . .