Includes: protocols of sessions of the Group; shorthand reports of the decisions dealing with the following problems: the lighting technology (illuminating engineering), the astronomy, the spectral analysis, teaching of physics in higher school, physical properties of liquids, the photoeffect and secondary emission, the dielectrics, the optic-technology, the cryogenics, the atomic molecular spectroscopy, the propogation of oscillations and seismology, the electric discharge in gases, semiconductions and photoelements, acoustics; plans for research in the institutions of the Group; reports on the activity of the institutions of the Group; orders and directions; staff and financial documentation; materials (including materials on conference planning and preparation). pecifically, materials relating to the All-Union Conferences on Atomic Nucleus (1935-1938), the Conference on the Physics of Dielectrics (1935); the Workshop on Surface Phenomena (1936), and others; materials on conferments of the workers in the Group institutions; reports given on the sessions of the Group (A. I. Alikhanyan, "The Formation of Couples by Gamma-radiation and Internal Conversion of Gamma-rays" (1936); V. I. Vexler, "The Heavy Particles in Cosmic Radiation (1937); P. A. Cherenkov, "Visible Radiation by Quick Moving Electrons" (1938); and others; the resolution of the Commission lead by D. S. Rozhdestvenskij about the possibility to develop research of molecular structure in the Soviet Union.