| Accounting | 59 |
| Acridology | 4 |
| Agriculture | 905 |
| Animal husbandry | 34 |
| Antennas and waveguides | 20 |
| Art | 6 |
| Astronautics | 9 |
| Automated equipment | 65 |
| Automatic control | 11 |
| Aviation | 5 |
| Banking | 2 |
| Biology | 5 |
| Biotechnology | 10 |
| Book binding | 1 |
| Botany | 5 |
| Brewery | 3 |
| Business | 26 |
| Cables and cable production | 1 |
| Canada | 6 |
| Ceramics | 1 |
| Chemical fibers | 3 |
| Chemistry | 415 |
| Climatology | 1 |
| Coal | 44 |
| Commerce | 126 |
| Communications | 1048 |
| Computer networks | 4 |
| Computer numerical control | 9 |
| Construction | 113 |
| Corporate governance | 64 |
| Criminal law | 38 |
| Cultural studies | 42 |
| Customs | 5 |
| Data processing | 26 |
| Demography | 18 |
| Dyalysis | 16 |
| Dyes | 8 |
| Earth sciences | 293 |
| Economics | 893 |
| Education | 106 |
| Electric machinery | 14 |
| Electric motors | 10 |
| Electric traction | 8 |
| Electricity generation | 5 |
| Electrochemistry | 2 |
| Electronics | 666 |
| Employment | 7 |
| Energy industry | 86 |
| English | 6 |
| Environment | 355 |
| European Union | 15 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Finances | 1534 |
| Fish farming pisciculture | 92 |
| Fishery fishing industry | 23 |
| Food industry | 108 |
| Food service and catering | 23 |
| Forestry | 81 |
| General | 2137 |
| Genetics | 24 |
| Geography | 1 |
| Government, administration and public services | 37 |
| Health care | 260 |
| Hobbies and pastimes | 26 |
| Horticulture | 8 |
| Human rights activism | 121 |
| Hydrology | 2 |
| Ichthyology | 1 |
| Immigration and citizenship | 85 |
| Industry | 439 |
| Information technology | 738 |
| Insurance | 217 |
| International law | 9 |
| International Monetary Fund | 749 |
| International trade | 34 |
| Isolation | 11 |
| Knitted goods | 3 |
| Labor law | 121 |
| Labor organization | 4 |
| Laboratory equipment | 2 |
| Law | 1109 |
| Leather | 2 |
| Librarianship | 7 |
| Life sciences | 154 |
| Lighting other than cinema | 3 |
| Loading equipment | 46 |
| Magnetics | 4 |
| Marketing | 211 |
| Materials science | 200 |
| Mathematics | 53 |
| Measuring instruments | 57 |
| Mechanic engineering | 322 |
| Mechanics | 3 |
| Medical | 570 |
| Metallurgy | 359 |
| Mexican | 20 |
| Microbiology | 2 |
| Microsoft | 262 |
| Milk production | 10 |
| Mineral products | 11 |
| Mining | 11 |
| Municipal planning | 16 |
| Name of organization | 226 |
| Natural resourses and wildlife conservation | 17 |
| Natural sciences | 133 |
| Nautical | 2 |
| Nuclear and fusion power | 3 |
| Nuclear physics | 19 |
| Obsolete / dated | 30 |
| Oil / petroleum | 9 |
| Packaging | 408 |
| Patents | 463 |
| Pest control | 11 |
| Pharmacy and pharmacology | 34 |
| Photography | 1 |
| Physical sciences | 5 |
| Physics | 6 |
| Piezoelectric crystals | 4 |
| Plastics | 7 |
| Politics | 316 |
| Power electronics | 1 |
| Power lines | 21 |
| Power system protection | 11 |
| Private international law | 3 |
| Procedural law | 39 |
| Pulp and paper industry | 4 |
| Radio | 20 |
| Radiology | 6 |
| Rail transport | 16 |
| Reliability | 12 |
| Religion | 7 |
| Remote sensing | 6 |
| Research and development | 9 |
| Resins | 1 |
| Risk Management | 2 |
| Satellite communications | 4 |
| Scientific | 11 |
| Scuba diving | 1 |
| Security systems | 30 |
| Semiconductors | 1 |
| Social science | 313 |
| Socialism | 16 |
| Sociology | 19 |
| Soil science | 9 |
| Sound recording | 7 |
| Spanish | 52 |
| Statistics | 204 |
| Sugar production | 2 |
| Superconductivity | 3 |
| Taxes | 120 |
| Technology | 144 |
| Telecommunications | 18 |
| Telegraphy | 14 |
| Textile industry | 205 |
| Thermal Energy | 3 |
| Tobacco industry | 2 |
| Trade unions | 13 |
| Transformers | 4 |
| Transport | 1221 |
| United Nations | 487 |
| Vacuum tubes | 1 |
| Veterinary medicine | 6 |
| Video recording | 2 |
| Virology | 1 |
| Waste management | 2 |
| Water resources | 42 |
| Welding | 1 |
| Welfare & Social Security | 2 |
| Wind Energy | 1 |
| Wood processing | 25 |
| Work flow | 72 |
