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| Douglas fir (Pseudotsuga douglasii, Pseudotsuga menziesii, Pseudotsuga taxifolia); Douglas spruce (Pseudotsuga douglasii, Pseudotsuga menziesii, Pseudotsuga taxifolia); oregon pine (Pseudotsuga douglasii, Pseudotsuga menziesii, Pseudotsuga taxifolia); red fir (Pseudotsuga douglasii, Pseudotsuga menziesii, Pseudotsuga taxifolia) | |||
| sapin douglas: 16 phrases in 5 subjects |
| Agriculture | 2 |
| Entomology | 4 |
| Forestry | 5 |
| Natural sciences | 4 |
| Pest control | 1 |