主题
Petroleum industry and trade
History
217
Political aspects
179
Energy policy
117
Politics and government
98
Environmental aspects
96
Government policy
95
Petroleum
87
Economic conditions
77
Foreign relations
74
Gas industry
67
Social aspects
54
Petroleum reserves
53
Economic aspects
52
Prices
46
Petroleum products
44
Social conditions
44
Foreign economic relations
37
Petroleum engineering
34
Energy consumption
33
Power resources
26
World politics
26
Economic policy
24
Forecasting
22
Petroleum law and legislation
20
Economic development
19
Environmental conditions
19
Natural resources
18
Geopolitics
17
Energy industries
16
Government ownership
16
Finance
15
Oil fields
15
Renewable energy sources
15
International economic relations
14
Natural gas
14
Prospecting
14
Equipment and supplies
13
Management
13
Econometric models
12
Energy development
12
Environmental protection
12
National security
12
Oil spills
12
Petroleum pipelines
12
Social responsibility of business
12
Climatic changes
11
Corrupt practices
11
Indians of South America
11
Industria petrolera
11
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