Subject
Petroleum industry and trade
History
216
Political aspects
182
Energy policy
118
Politics and government
100
Environmental aspects
97
Government policy
96
Petroleum
87
Economic conditions
76
Foreign relations
75
Gas industry
68
Petroleum reserves
54
Social aspects
54
Economic aspects
52
Prices
47
Petroleum products
45
Social conditions
44
Foreign economic relations
36
Petroleum engineering
34
Energy consumption
33
Power resources
27
World politics
27
Economic policy
24
Forecasting
22
Petroleum law and legislation
20
Economic development
19
Environmental conditions
19
Natural resources
18
Energy industries
17
Geopolitics
17
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
Petroleum pipelines
13
Econometric models
12
Energy development
12
Environmental protection
12
National security
12
Oil spills
12
Social responsibility of business
12
Climatic changes
11
Corrupt practices
11
Indians of South America
11
Industria petrolera
11
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