TJ Mechanical engineering and machinery 23 Polymers. Macromolecules 10 Polymers and polymer manufacture 9 Chemical elements 5 Chemical engineering 5 Inorganic polymers 5 Polymers. Polymeric composites 5 Analytical chemistry 3 Biotechnology 3 Concrete 3 Electrolytes, electrolyte solutions 3 Materials of engineering and construction 3 Organic chemistry 3 Physical and theoretical chemistry 3 Polyethylene 3 Reinforced plastics 3 Biochemistry 2 Chemicals 2 Clay industries. Ceramics. Glass 2 Conditions and laws of chemical reactions 2 Laboratory manuals. Testing of soils. Measurements 2 Machine construction (General) 2 Machine design and drawing 2 Oils, fats, and waxes 2 Paints, pigments, varnishes, etc 2 Plastics 2 Polystyrene 2 TP Chemical technology 2 Aeronautics. Aeronautical engineering 1 Analysis 1