Oil Shale
1995
http://www.ester.ee/record=b1072685*est
Oil shale
2002
https://www.ester.ee/record=b1072685*est
Oil shale
2003
Oil shale
2008
Oil shale
1997
Oil Shale
2001
http://www.ester.ee/record=b1072685*est
Oil shale
2019
https://kirj.ee/oilshale/
https://www.ester.ee/record=b1072685*est
Oil shale
2020
https://kirj.ee/oilshale/
https://www.ester.ee/record=b1072685*est
Oil shale
2021
https://kirj.ee/oilshale/
https://www.ester.ee/record=b1072685*est
Oil shale
2022
https://www.ester.ee/record=b1072685*est
https://kirj.ee/oilshale/
Oil shale
2023
https://www.ester.ee/record=b1072685*est
https://kirj.ee/oilshale/