Müller, J. (1847). Monographie der Petrefacten der Aachener Kreideformation. Erste Abtheilung. Henry & Cohen, Bonn, 88 + pls 3-6 pp., available online athttps://books.google.com/books?id=m8MoAQAAMAAJ page(s): 35, pl. 2, fig. 9a, b [details]
original descriptionMüller, J. (1847). Monographie der Petrefacten der Aachener Kreideformation. Erste Abtheilung. Henry & Cohen, Bonn, 88 + pls 3-6 pp., available online athttps://books.google.com/books?id=m8MoAQAAMAAJ page(s): 35, pl. 2, fig. 9a, b [details]
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