Letters of Alexander Von Humboldt Author:Alexander von Humboldt Subtitle: 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 General Books publication date: 2009 Original publication date: 1860 Original Publisher: Trübner and Co. Subjects: Scientists Authors, German Biography