Economic conditions (1) Development (1) Family relationships (1) History (1) Observations (1) Methodology (1) Observations (1) Scientists (1) Quality of life (1) Lifestyles (1) Licenses (1) Working class (1) Generations (1) Europeans (1) Cost and standard of living (1) Building (1) Authors (1) Technique (1) Research (1) Design (1) Sociological aspects (1) Social life and customs (1) Name (1) Family (1) Generaciones (1) Autorizaciones (1) Escritores (1) Científicos (1) Coste de vida (1) Nivel de vida (1)