Documents Mining and Water Oil-shale is the most valuable mineral in Estonia. For years people have produced.....

Slide 1Mining and Water Oil-shale is the most valuable mineral in Estonia. For years people have produced energy from oil-shale. Energy for getting light and warmth: first…

Documents Mining and Water

Mining and Water Oil-shale is the most valuable mineral in Estonia. For years people have produced energy from oil-shale. Energy for getting light and warmth: first lamp-oil,…