Ouest (1) Allemagne (1) Differentiation (1) Development (1) Deterioration (1) Marketing (1) Costs (1) Control (1) Boundaries (1) City dwellers (1) Notions (Philosophy) (1) Water (1) Unemployment (1) Social control (1) Size reduction of materials (1) Service industries (1) Regional planning (1) Population (1) Politics, Practical (1) Political science (1) Markets (1) Maintenance (1) Hypothesis (1) Germans (1) Foundations (1) Fertility, Human (1) Economics (1) Drinking water (1) Depressions (1) Demography (1)