German article in Die Gartenlaube, 1894, no. 42

German article in Die Gartenlaube, 1875, no. 2

libro de Alfred Brehm

German article in Die Gartenlaube, 1882, no. 52

German article in Die Gartenlaube, 1894, no. 25

German article in Die Gartenlaube, 1874, no. 24

German article in Die Gartenlaube, 1880, no. 7

German article in Die Gartenlaube, 1883, no. 20

German article in Die Gartenlaube, 1888, no. 50

German article in Die Gartenlaube, 1887, no. 47

German article in Die Gartenlaube, 1877, no. 41

German article in Die Gartenlaube, 1885, no. 26

German article in Die Gartenlaube, 1876, no. 3, 10, 12, 17

German article in Die Gartenlaube, 1875, no. 25

German article in Die Gartenlaube, 1885, no. 13

German article in Die Gartenlaube, 1886, no. 6

German article in Die Gartenlaube, 1872, no. 52