German article in Die Gartenlaube, 1870, no. 17

German article in Die Gartenlaube, 1867, no. 35 und 49

German article in Die Gartenlaube, 1873, no. 12

German article in Die Gartenlaube, 1870, no. 29

German article in Die Gartenlaube, 1868, no. 18

German article in Die Gartenlaube, 1866, no. 4

German article in Die Gartenlaube, 1866, no. 6

German article in Die Gartenlaube, 1866, no. 37

German article in Die Gartenlaube, 1869, no. 7

German article in Die Gartenlaube, 1869, no. 33

map by Adolf Eltzner, 1864

German article in Die Gartenlaube, 1865, no. 30

German article in Die Gartenlaube, 1857, no. 32, 34, 37