Europe de l'Ouest (1) puits (1) enquête (1) spectacle (1) papier (1) séparation des masses (physique) (1) littérature (1) histoire (1) analyse (1) éducation (1) enfant (1) survie (1) Europe (1) Education (1) Family relationships (1) History (1) Composition (1) Communication (1) Methods (1) Surveys (1) Couples (1) Rich people (1) Europe, Western (1) Second-born children (1) Birth (1) Weights and measures (1) Survival (1) Stepfamilies (1) Statistics (1) Societies (1)