Genres
- Transportation
- Histoire sociale
- Frais d'exploitation
- Politique énergétique
- Aspect social
- Power resources
- Economic development
- Social aspects
- Social aspects of Transportation
- Social history
- Cost of operation
- Ressources énergétiques
- Transport
- Energy policy
- Energy conservation
- Energy development
- Technologie et civilisation
- Transports et communications
- Évolution sociale
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