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- Douglas fir 35
- Greenhouses 5
- Oregon Forest Products Laboratory 5
- Seedlings 5
- Trees 5
- Waxes 5
- Laboratories 4
- Lumber trade 4
- Forests and forestry 3
- Timber 3
- Brick roads 2
- Corporations--Charitable contributions 2
- Gifts 2
- Log transportation 2
- Logging trucks 2
- Logging 2
- Lumber 2
- Railroad stations 2
- Railroad tracks 2
- Railroad trains 2
