52 ENVIRONMENT | MT 5211 natural environment | BT1 marine environment | BT2 aquatic environment | BT3 physical environment | RT coastal pollution [5216] | coastal protection [5206] | coastal region [1616]
52 ENVIRONNEMENT | MT 5211 milieu naturel | BT1 milieu marin | BT2 milieu aquatique | BT3 environnement physique | RT pollution des côtes [5216] | protection du littoral [5206] | région côtière [1616]