Roumanie (1) Blois (1) Education (1) School attendance (1) School age (Entrance age) (1) Rural-urban migration (1) Percentage (1) Notebooks (1) Males (1) Livestock (1) Working class (1) Hell (1) Head (1) Flight (1) Ethnicity (1) Equations (1) Domestic animals (1) Demography (1) Use studies (1) Use studies (1) Mathematical models (1) Rates (1) Authorship (1) Habitat (1) Migrations (1) Migration (1) Vuelo (1) Absentismo escolar (1) Éxodo rural (1) Ganado (1)