Topics
Economic conditions
Economic aspects
11
Hydroelectric power plants
7
Social aspects
4
Social conditions
4
Business enterprises
3
Dams
3
Economic forecasting
3
Economic surveys
3
Forecasting
3
Household surveys
3
Population forecasting
3
Mathematical models
2
Planning
2
Sociological aspects
2
Bus travel
1
Economic history
1
Housing
1
Municipal services
1
Regional economics
1
Social surveys
1
Telephone surveys
1
Transportation
1