| Accounting | 14 |
| Agriculture | 516 |
| Animal husbandry | 3 |
| Antennas and waveguides | 20 |
| Art | 1 |
| Astronautics | 6 |
| Automatic control | 15 |
| Banking | 1 |
| Business | 1 |
| Cables and cable production | 12 |
| Chemistry | 278 |
| Coal | 47 |
| Commerce | 14 |
| Communications | 791 |
| Computer networks | 1 |
| Construction | 47 |
| Criminal law | 2 |
| Cultural studies | 11 |
| Customs | 1 |
| Demography | 2 |
| Earth sciences | 375 |
| Economics | 191 |
| Education | 26 |
| Electric machinery | 2 |
| Electric motors | 36 |
| Electric traction | 37 |
| Electricity generation | 14 |
| Electronics | 1114 |
| Energy industry | 26 |
| Environment | 183 |
| Finances | 349 |
| Fish farming pisciculture | 31 |
| Food industry | 14 |
| Forestry | 28 |
| General | 673 |
| Government, administration and public services | 17 |
| Health care | 135 |
| Hobbies and pastimes | 3 |
| Human rights activism | 7 |
| Immigration and citizenship | 8 |
| Industry | 518 |
| Information technology | 520 |
| Insurance | 78 |
| International Monetary Fund | 157 |
| Isolation | 5 |
| Labor law | 48 |
| Law | 281 |
| Librarianship | 8 |
| Life sciences | 121 |
| Lighting other than cinema | 6 |
| Magnetics | 10 |
| Marketing | 29 |
| Materials science | 141 |
| Mathematics | 118 |
| Mechanic engineering | 328 |
| Medical | 479 |
| Metallurgy | 464 |
| Mexican | 1 |
| Microsoft | 175 |
| Mineral products | 1 |
| Mining | 1 |
| Municipal planning | 21 |
| Natural sciences | 131 |
| Nuclear and fusion power | 3 |
| Nuclear physics | 22 |
| Obsolete / dated | 1 |
| Patents | 100 |
| Pharmacy and pharmacology | 34 |
| Physical sciences | 9 |
| Physics | 1 |
| Politics | 26 |
| Polymers | 2 |
| Power electronics | 11 |
| Power lines | 14 |
| Power system protection | 9 |
| Private international law | 3 |
| Procedural law | 21 |
| Radio | 35 |
| Radiology | 7 |
| Rail transport | 14 |
| Reliability | 22 |
| Research and development | 1 |
| Satellite communications | 18 |
| Scientific | 6 |
| Security systems | 4 |
| Semiconductors | 13 |
| Social science | 52 |
| Sociology | 6 |
| Sound recording | 4 |
| Statistics | 132 |
| Superconductivity | 25 |
| Taxes | 23 |
| Technology | 381 |
| Telecommunications | 9 |
| Telegraphy | 22 |
| Telephony | 4 |
| Textile industry | 4 |
| Thermal Energy | 66 |
| Trade unions | 3 |
| Transformers | 2 |
| Transport | 446 |
| United Nations | 9 |
| Vacuum tubes | 4 |
| Waste management | 2 |
| Welding | 14 |
| Wood processing | 1 |
| Work flow | 34 |
