Ueber die nordamerikanische Elster, (Pica hudsonica Bonap.)
Article
1856
Journal für Ornithologie
4
197--204
BioStor
Multiple
Berlin, Friedländer,
BioStor: https://biostor.org/reference/142890 DOI: https://doi.org/10.1007/bf02002055
Public domain. The BHL considers that this work is no longer under copyright protection.
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