International Geological Congress: Report of the Twenty-third Session Czechoslovakia 1968
International Geological Congress: Report of the Twenty-third Session Czechoslovakia 1968
edited by Miroslav Malkovsky,Josef Vachtl and Bohuslav Hejtman
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- Prague Academia 1969
- 157p.
IGC- Report
551 / IGC
IGC- Report
551 / IGC