Subject
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Christmas trees
2
Classification
2
Clean coal
1
Clearcutting
2
Climate
1
Climate change
5
Coal
3
Coal Mines
1
Coal industry
2
Coal preparation
1
Coastlines
1
Cohasset
1
Collection and preservation
1
Combustion
1
Competition
1
Conifers
4
Conservation
9
Conservation areas
1
Conservation of natural resources
1
Control
1
Cost
1
Cougars
1
Crown land
7
Crown lands
26
Darwin, Charles, 1809-1882
1
Data
1
Data processing
1
Databases
1
Decision-making
1
Deer
1
Deer populations
1
Demographics
1
Design
2
Design and construction
2
Desulferization
1
Development
2
Diseases and pests
4
Dogs
1
Drilling rigs
1
Economic analysis
2
Economic aspects
10
Economic conditions
1
Economic policy
1
Economics
3
Ecosystem management
1
Ecosystems
2
Education
6
Education (Continuing education)
5
Effect of acid precipitation on
1
Effect of air pollution on
1
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