Oswald Heer (1809–1883), Paleontology, Botanics, Paleobotanics, Entomology
Courtesy: ETH Zürich Universitätsbibliothek / wikimedia.commons
Signatur: ETH-Bibliothek_Portr_11212
1860
https://commons.wikimedia.org/wiki/File:ETH-BIB-Heer,_Oswald_(1809-1883)-Portrait-Portr_11212.tif
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