Leuchtenberg, Maximilian von
born 1817; died 1852Brief von Gregor von Helmersen an Karl Ernst von Baer, 17.12.1841 [17ten December 1841]
Sankt Petersburg, 17/12/1841Brief von Alexander von Nordmann an Karl Ernst von Baer, 15.12.1849-27.12.1849 [15/27 December 1849]
Helsinki, 1849-12-15/1849-12-27