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Topic
- Log transportation 10
- Loggers 10
- Logging 10
- Timber 10
- Natural resources 6
- Trees 6
- Forests and forestry 4
- Lumber trade 4
- Machinery 4
- Spruce 4
- Tractors 4
- Cranes, derricks, etc 2
- Hoisting machinery 2
- Timber--Rafting 2
