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Bibliography, International 15 Geography 15 Tourist trade 12 City planning 8 Environmental aspects 8 Architecture and energy conservation 7 Buildings 6 περισσότερα ... Statistics 6 Air traffic control 5 Automation 5 Cities and towns 4 Computer simulation 4 Conservation and restoration 4 Energy conservation 4 Monuments 4 OECD 4 Offshore structures 4 Passive systems 4 Power resources 4 Research 4 Airports 3 Energy 3 Energy policy 3 Engineering geology 3 Environmental policy 3 Government policy 3 International cooperation 3 Materials 3 OECD countries 3 Petroleum industry and trade 3 λιγότερα ...