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| Eastern Canadian spruce (Picea alba Link, Picea canadensis Britt. St.et P., Picea glauca); single spruce (Picea alba Link, Picea canadensis Britt. St.et P., Picea glauca); white spruce (Picea alba Link, Picea canadensis Britt. St.et P., Picea glauca) | |||
| abeto- do -canada: 4 phrases, 2 sujets |
| Sciences naturelles | 2 |
| Sylviculture | 2 |