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References
- 1 2 "Acharius Medallists Ludger Kappen". International Association for Lichenology. Retrieved 20 September 2022.
- 1 2 3 4 "Ludger Kappen". Zobodat. Retrieved 20 September 2022.
- ↑ "The Geological Collection of Prof. Dr. Ludger Kappen". Kulturerbe Niedersachsen. Retrieved 20 September 2022.
- ↑ Schroeter, Burkhard; Schlensog, M; Green, T.G.A (2000). New Aspects in Cryptogamic Research Contributions in Honour of Ludger Kappen. Berlin Stuttgart: Bibliotheca Lichenologica, Band 75. p. 464. ISBN 978-3-443-58054-4.
- ↑ "Acharius Medallists". International Association for Lichenology. Retrieved 21 September 2022.
This article incorporates public domain material from "Ludger Kappen". Geographic Names Information System . United States Geological Survey.
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