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Subject
- Forests and forestry107
- Geology97
- History87
- Forest management77
- Growth58
- Environmental aspects45
- Economic conditions43
- Indians of North America43
- Birds40
- Lodgepole pine33
- British Museum (Natural History)31
- Slavery31
- Trees30
- Mines and mineral resources28
- Description and travel27
- Douglas fir26
- Diseases and pests25
- Forest policy24
- Forest ecology23
- Politics and government23