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21. Ionosphere as a medium for earth communication and the partial prediction of the critical frequency for the F layer in the area of greece
22. Probable periodical variations in the frequency of the etesian winds
23. Weather and climate modification by human activity - Relevant questions in Greece area
24. Requiem for a comet
25. The importance of the parameters of seismic sequences to the problem of earthquake prediction
26. A new differential equation in mathematical physics
27. Aristarchus of Samos, the founder of astronomy
28. Solar research in europe. Site testing for solar observatory
29. The astronomical station of Pentele (Athens)
30. Interplanetary space research from observations of comets
31. The center of mass of a system of N extended bodies in general relativity
32. Aristarchos von samos
33. Der beitrag der metallhaltigen larger von silber des antiken Laurium's zur rettung der stadt athen und ihrer kultur
34. Preparation and reductions of photoelectric observations with the help of electronic computer