Contents : v.26. Light and matter -- v.27. Spectroscopy I -- v.28. Spectroscopy II -- v.29. Optical instuments -- v.30. X-Rays -- v.32. Structural research -- v.33. Optics of corpuscles -- v.34. Corpuscles and radiation in matter II -- v.35. Atoms I -- v.36. Atoms II -- v.37/1. Atoms III -- Molecules I -- v.37/2 Molecules II -- v.38/1 External properties of atomic nuclei -- v.38/2 neutrons and related gamma ray problems -- v.39. Structure ao atomic nuclei -- v.40. Nuclear reactions I -- v.41. Nuclear reactions II: theory -- v.42. Nuclear reactions III -- v.44. Nulear instrumenntation I -- v.45. Nulear instrumenntation II -- v.46/1. Cosmic rays I -- v.46/2. Cosmic rays II -- v.48/2. Geophysics II -- v.49/1 Geophysics III -- v.49/2 Geophysics III part II -- v.49/3 Geophysics III part III -- v.49/4 Geophysics III part iv -- v.49/5 Geophysics III part v -- v.49/7 Geophysics III part vii -- v.50. Astrophysics I : stellar surfaces-binaries -- v.51. Astrophysics II : stellar structure -- v.52. Astrophysics III : the solar system -- v.53. Astrophysics iv : stellar system -- v.54. Astrophysics v : miscellaneous