Forecasts Twenty-first century 21 Twentieth century 14 Forecasting 8 Civilization, Modern 3 History 3 Congresses 2 Máis ... Economic forecasting 2 Military art and science 2 Natural resources 2 Population forecasting 2 Technological forecasting 2 War 2 Aids and devices 1 Astronautics, Military 1 Catalogs 1 Children with disabilities 1 Cities and towns 1 Civilization 1 Communication 1 Economic conditions 1 Economic policy 1 Education 1 Educational planning 1 Educational technology 1 Effect of human beings on 1 Environmental policy 1 Environmental protection 1 Family 1 Family policy 1 menos ...