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| Fichtenröhrenlaus f (Liosomaphis abietinum); Grüne Fichtenblattlaus (Liosomaphis abietinum); Sitkafichtenlaus f (Liosomaphis abietinum) | |||
| puceron de l'épinette: 11 phrases in 3 subjects |
| Entomology | 5 |
| Natural resourses and wildlife conservation | 3 |
| Natural sciences | 3 |