. "1888" . . "Historical-Geographical method" . . . . . . "Julius Krohn" . . . "Krohn family" . . . . . . . . . . "Julius Krohn" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "1835" . . . . . "1835-04-19" . .