Oil Shale1995 http://www.ester.ee/record=b1072685*est

Oil shale2002 https://www.ester.ee/record=b1072685*est

Oil shale2003

Oil shale2008

Oil shale1997

Oil Shale2001 http://www.ester.ee/record=b1072685*est

Oil shale2019 https://kirj.ee/oilshale/ https://www.ester.ee/record=b1072685*est

Oil shale2020 https://kirj.ee/oilshale/ https://www.ester.ee/record=b1072685*est

Oil shale2021 https://kirj.ee/oilshale/ https://www.ester.ee/record=b1072685*est

Oil shale2022 https://www.ester.ee/record=b1072685*est https://kirj.ee/oilshale/

Oil shale2023 https://www.ester.ee/record=b1072685*est https://kirj.ee/oilshale/