Apparatus and Method of Investigating Multiple Production at Energies of Hundreds of GeV.- Method of Treatment of Experimental Data Obtained with Cloud Chamber.- Experimental Data on Inelastic Strong Interaction at Energies of 100-3000 GeV and Their Interpretation.- Extensive Air Showers and Interaction of Particles with Energies above 1013 eV.- Apparatus for Investigation of Extensive Air Showers and Nuclear Interactions of Cosmic-Ray Particles with Energy 1012-1016 eV.- Quasi-nucleonic Nuclear Interactions of 23-GeV Protons in a Nuclear Emulsion Irradiated in a Pulsed Magnetic Field of 180 kOe.- Measurement of Energy of Electron - Photon Cascades by Photometry of Spots on X-Ray Films.- Transition Effects in the Ionization Calorimeter.- Investigation of the Nuclear Component of Cosmic Rays in a Period of Minimum Solar Activity.