| Translated title | The Bonn geologist and mineralogist Professor Dr. Ferdinand Zirkel (1838–1912) in a portrait by the Leipzig medallist Professor Carl Seffner |
|---|---|
| Author | Bernd Müller |
| Published in | Bonner Numismatische Studien, Band 1 (2008) |
| Pages | 285-296 (12 pages) |
| Language | German |
| Number | N# L229135 |
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