| AA | Philosophy and religion |
| AB | History |
| AC | Archaeology, anthropology, ethnology |
| AD | Political sciences |
| AE | Management, administration and clerical work |
| AF | Documentation, librarianship, work with information |
| AG | Legal sciences |
| AH | Economics |
| AI | Linguistics |
| AJ | Literature, mass media, audio-visual activities |
| AK | Sport and leisure time activities |
| AL | Art, architecture, cultural heritage |
| AM | Pedagogy and education |
| AN | Psychology |
| AO | Sociology, demography |
| AP | Municipal, regional and transportation planning |
| AQ | Safety and health protection, safety in operating machinery |
| BA | General mathematics |
| BB | Applied statistics, operational research |
| BC | Theory and management systems |
| BD | Information theory |
| BE | Theoretical physics |
| BF | Elementary particle theory and high energy physics |
| BG | Nuclear, atomic and molecular physics, accelerators |
| BH | Optics, masers and lasers |
| BI | Acoustics and oscillation |
| BJ | Thermodynamics |
| BK | Liquid mechanics |
| BL | Plasma physics and discharge through gases |
| BM | Solid-state physics and magnetism |
| BN | Astronomy and celestial mechanics, astrophysics |
| BO | Biophysics |
| CA | Inorganic chemistry |
| CB | Analytical chemistry, separation |
| CC | Organic chemistry |
| CD | Macromolecular chemistry |
| CE | Biochemistry |
| CF | Physical chemistry and theoretical chemistry |
| CG | Electrochemistry |
| CH | Nuclear and quantum chemistry, photo chemistry |
| CI | Industrial chemistry and chemical engineering |
| DA | Hydrology and limnology |
| DB | Geology and mineralogy |
| DC | Seismology, volcanology and Earth structure |
| DD | Geochemistry |
| DE | Earth magnetism, geodesy, geography |
| DF | Pedology |
| DG | Atmospheric sciences, meteorology |
| DH | Mining industry including coal mining and processing |
| DI | Pollution and air control |
| DJ | Pollution and water control |
| DK | Contamination and decontamination of soil including pesticides |
| DL | Nuclear waste, radioactive pollution and control |
| DM | Solid waste and its control, recycling |
| DN | Environmental impact on health |
| DO | Protection of landscape |
| EA | Morphological game parks and cytology |
| EB | Genetics and molecular biology |
| EC | Immunology |
| ED | Physiology |
| EE | Microbiology, virology |
| EF | Botany |
| EG | Zoology |
| EH | Ecology - communities |
| EI | Biotechnology and bionics |
| FA | Cardiovascular diseases including cardio-surgery |
| FB | Endocrinology, diabetology, metabolism, nutrition |
| FC | Pneumology |
| FD | Oncology and haematology |
| FE | Other fields of internal medicine |
| FF | ENT (ie. ear, nose, throat), ophthalmology, dentistry |
| FG | Paediatrics |
| FH | Neurology, neuro-surgery, nuero-sciences |
| FI | Traumatology and orthopaedics |
| FJ | Surgery including transplantology |
| FK | Gynaecology and obstetrics |
| FL | Psychiatry, sexology |
| FM | Hygiene |
| FN | Epidemiology, infection diseases and clinical immunology |
| FO | Dermatology and venereology |
| FP | Other medical fields |
| FQ | Public health system, social medicine |
| FR | Pharmacology and apothecary chemistry |
| FS | Medical facilities, apparatus and equipment |
| GA | Agricultural economics |
| GB | Agricultural machines and construction |
| GC | Plant growing, crop rotation |
| GD | Fertilization, irrigation, soil treatment |
| GE | Plant cultivation |
| GF | Diseases, pests, weeds and plant protection |
| GG | Zootechnics |
| GH | Nutrition of farm animals |
| GI | Farm animal breeding and farm animal pedigree breeding |
| GJ | Diseases and animal vermin, veterinary medicine |
| GK | Forestry |
| GL | Fishery |
| GM | Food industry |
| IN | Informatics |
| JA | Electronics and optoelectronics |
| JB | Sensors, detecting elements, measurement and regulation |
| JC | Computer hardware and software |
| JD | Use of computers, robotics and its application |
| JE | Non-nuclear power engineering, energy consumption and utilization |
| JF | Nuclear energy |
| JG | Metallurgy, metal materials |
| JH | Ceramics, fire-proof materials and glass |
| JI | Composite materials |
| JJ | Other materials |
| JK | Corrosion and material surfaces |
| JL | Fatigue and fracture mechanics |
| JM | Structural engineering |
| JN | Civil engineering |
| JO | Land transport systems and equipment |
| JP | Industrial processes and processing |
| JQ | Machinery and tools |
| JR | Other machinery industry |
| JS | Reliability and quality management, industrial testing |
| JT | Propulsion, engines and fuels |
| JU | Aeronautics, aerodynamics, aeroplanes |
| JV | Cosmic technologies |
| JW | Navigation, connection, detection and countermeasure |
| JY | Firearms, ammunition, explosives, combat vehicles |
| KA | Militarism |