Berlin,D. Reimer (E. Vohsen)1912. | New York Botanical Garden, LuEsther T. Mertz Library
German article in Die Gartenlaube, 1875, no. 2
German article in Die Gartenlaube, 1871, no. 3
German article in Die Gartenlaube, 1884, no. 38
German article in Die Gartenlaube, 1885, no. 40
London :G. Philip & Son,1888. | Field Museum of Natural History Library
Berolini: G. Reimer, 1862.
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