NAUMANN

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Public domain
This image comes from the book Naumann, Naturgeschichte der Vögel Mitteleuropas (Natural history of the birds of central Europe) of 1905 or his earlier works. The copyrights for those books have expired and this image is in the public domain. See here

Comment: Earlier works include:

Naumann, Naturegeschichte der Vogel Mitteleuropas: Band V, Tafel 2 - Gera, 1899
Naturgeschichte der Vögel Mitteleuropas Gera, 1897
Naturgeschichte der Vögel Mitteleuropas, 1. Auflage (1796-1803)
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