@book{UBHD-1734633, author={Humboldt, Alexander von}, title={Letters of 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 ; authorized transl. from the German with explanatory notes and a full index of names}, publisher={Tr{\"u}bner}, address={London}, year={1860}, pages={XXVI, 334 S.}, language={eng}, library={UB [Signatur: F 6898-2 B]}, }