Subject
Economics
Coal
47
Environment
24
Sustainable development
22
Forest management
17
Policy
16
Environmental impacts
14
Supply and demand
14
Energy
13
Natural gas
13
Statistics
13
Symposia
13
Mining
12
Natural resources
12
Mineral industry
11
Forestry
10
Petroleum
10
Recreation
10
Research
10
Technology
10
Tourism
10
Development
9
Management
9
Coal deposits
8
Economic development
8
Energy conservation
8
Exports
8
Forest products industries
8
Markets
8
Tidal power
8
Wood chips
8
Coal mining
7
Forests and forestry
7
Offshore industry
7
Outdoor recreation
7
Planning
7
Coal gasification
6
Cogeneration
6
Electric power
6
Employment
6
Forest resources
6
Geology
6
Industry
6
Land use
6
Models
6
Production
6
Silviculture
6
Taxes
6
Wildlife
6
Beneficiation
5
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