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MEYER, Adolf Bernhard. (1889-1897). Abbildungen von Vogel-Skeletten. Band II. Berlin : R. Friedländer & Sohn. Planche CLVIII, https://www.biodiversitylibrary.org/item/110724#page/223/mode/1up. DOI : https://doi.org/10.5962/bhl.title.51853.