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Photo credit
Johann Baptist Kirner, “Volz as a natural scientist”, 1850er Jahre, Augustinermuseum, L 2021/002, Sammlung Guido Staeb | Foto: Axel Killian, CC BY 4.0
Citation link
https://onlinesammlung.freiburg.de/index.php/en/object/1E80CFEBA9F84132A200D88243510EDD