monde (1) chômage (1) temps (durée) (1) établissement scolaire (1) mine (1) littérature (1) analyse (1) combustible fossile (1) emploi (1) effet (1) économie (1) science économique (1) extraction de charbon (1) charbon (1) point (1) taux (1) Dynamics (1) Employment (1) Control (1) Methods (1) Programs (1) Mine closures (1) States (1) Year (1) Work (1) Unemployment (1) Time (1) Telecommuting (1) Percentage (1) Literature (1)