China

​

Postcard - 1990

​

Geological chart

​

​

CCCP- Rossija

​

Cover - 1968

​

Geological prospecting

​

​

​

Polska

​

FDC -  03 - 11 - 1976

​

Aleksander Czekanowski

​

Polish geologist and explorer

of Siberia

​

​

France

​

FDC -  05 - 07 -1980​

​

26th  Int. Geologic Congress

​

​

France

​

IP -  05 - 07 -1980​

​

Sciences de la terre

​

​

Rossija - CCCP

​

IP - 1984​

​

278 th Geochemical congress

​

​

China P.R.

​

IP -  24 - 7 -1990​

​

14th World Mining Congress

​

​

Somalia

​

FDC -  24 - 11 -1987​

​

Geosom 97

Somali Plate

​

​

United Nation

Vienna

​

FDC -  29 - 10 -1993​

​

Climate - Volcano

​

​

South Africa

​

FDC -  26 - 08 -2018​

​

35TH Geological Congress

​

​

South Africa

​

FDC -  26 - 08 -2018​

​

35TH Geological Congress