Mortality (1) Children (1) Assaying (1) Nineteen sixties (1) Gross domestic product (1) Plumbing fixtures (1) Twentieth century (1) Social classes (1) Poverty (1) Plumbing--Equipment and supplies (1) Matter (1) Income (1) Fortune (1) Evidence (1) Equality (1) Economics (1) Attention (1) Analysis (1) Sanitary affairs (1) Evolution (1) Relations (1) Population (1) Health (1) Suerte (1) Aparatos sanitarios (1) Salud (1) Igualdad (1) Desigualdad social (1) Pobreza (1) Renta (1)