Modest Bogdanow: Die Vögel des Kaukasus. Kasan 1879
Article
1880
Journal für Ornithologie
28
Series: 4
254--276
BioStor
German
Berlin, Friedländer,
BioStor: https://biostor.org/reference/142141 DOI: https://doi.org/10.1007/bf02001221
Public domain. The BHL considers that this work is no longer under copyright protection.
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