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| Gelbe Birken-Blattlaus (Calaphis flava); Gemeine Birkenzierblattlaus (Euceraphis punctipennis); Gemeine Birkenzierlaus (Euceraphis punctipennis) | |||
| birch aphid: 5 phrases in 2 subjects |
| Entomology | 3 |
| Natural sciences | 2 |
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