1778-1842 1780-1806 1781-1831 1785-1859 1800-1854 1800-1897 1823-1891 19thcentury authors bettinavon brentano briefsammlung clemens correspondence correspondencehössli familyarnim german günderode hardegg juliusvon karlvon karolinevon ludwigachim philipp sohn württemberg