Eine hahnenfederig werdende Birk-Henne
Article
1854
Journal für Ornithologie
2
88--89
BioStor
Multiple
Berlin, Friedländer,
BioStor: https://biostor.org/reference/141959 DOI: https://doi.org/10.1007/bf02001931
Public domain. The BHL considers that this work is no longer under copyright protection.
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