région (3) activité minière (3) Mining engineering (3) Mines and mineral resources (3) Mineral industries (3) Lead (3) Landscapes (3) Droughts (3) Climatic changes (3) pollution (2) mercure (2) plomb (2) lac (2) document (2) Bolivie (2) Composition (2) Antiquities, Prehistoric (2) Evolution (Biology) (2) Rates (2) Water (2) Values (2) Social sciences (2) Rivers (2) Pollution (2) Occupations (2) Mountains (2) Methodology (2) Mercury (2) Prehistoric peoples (2) Example (2)