Diatoms (Biology, 1995) |
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| Christian Bornkessel | School year? | Supervisor Karl Heuel | |
Diatom Studies at the Erft River in Bad Münstereifel (Biology, 1994) |
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| Jan Behrend, Christian Bornkessel | Supervisor Karl Heuel | ||
| Awards | |||
Study of Leech and Planarian Polulations (Biology, 1993) |
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| Christian Bornkessel, Dennis Schneider | Supervisor Karl Heuel | ||
| Awards | |||
Ecological Importance of Selected Species in the Erft River around Bad Münstereifel (Biology, 1992) |
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| Ulrike Arnold, Christian Bornkessel, Daniela Lippik | Supervisor Karl Heuel | ||
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Jan Behrend and Christian Bornkessel present their project at the regional contest |
| Christian Bornkessel and Dennis Schneider at their exhibit |  |
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Ulrike Arnold and Christian Bornkessel at their exhibit at the regional contest |
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