Institute of Geology 2001 : [annual report]
2002
https://www.ester.ee/record=b1631976*est
Institute of Geology 2002 : [annual report]
2002
https://www.ester.ee/record=b1631976*est
Institute of Geology 2003 : [annual report]
2004
https://www.ester.ee/record=b1631976*est