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Plan of operation - Survey of the seismicity of the Balkan region (REG.172)

Plan of operation - Survey of the seismicity of the Balkan region (REG.172)

Programme de participation - Project 4926 - Seminar for young teachers to be ...

Programme de participation - Project 4926 - Seminar for young teachers to be held at Bursa (July 1960) organized by the Turkish National Commission and the Unesco Institute for Education (Germany)...