| Accounting | 527 |
Health care | 3240 |
Politics | 1531 |
| Accumulators | 91 |
Hobbies and pastimes | 732 |
Polymers | 22 |
| Agriculture | 10989 |
Human rights activism | 506 |
Power electronics | 113 |
| Animal husbandry | 114 |
Ichthyology | 4 |
Power lines | 226 |
| Antennas and waveguides | 407 |
Immigration and citizenship | 371 |
Power system protection | 237 |
| Art | 157 |
Industry | 9896 |
Printed circuit boards | 7 |
| Astronautics | 127 |
Information technology | 9568 |
Private international law | 13 |
| Automatic control | 237 |
Insurance | 1274 |
Procedural law | 254 |
| Aviation | 2 |
International law | 35 |
Public relations | 5 |
| Banking | 71 |
International Monetary Fund | 4706 |
Radio | 557 |
| Book binding | 1 |
International trade | 79 |
Radiology | 211 |
| Business | 86 |
Investment | 33 |
Rail transport | 239 |
| Cables and cable production | 89 |
Isolation | 151 |
Reliability | 168 |
| Chemistry | 5360 |
Labor law | 1100 |
Religion | 55 |
| Coal | 786 |
Labor organization | 34 |
Research and development | 152 |
| Commerce | 584 |
Latin American | 11 |
Risk Management | 23 |
| Communications | 12476 |
Law | 6970 |
Satellite communications | 61 |
| Computer networks | 69 |
Leather | 31 |
School | 7 |
| Computers | 8 |
Librarianship | 216 |
Scientific | 227 |
| Construction | 1729 |
Life sciences | 3312 |
Security systems | 83 |
| Corporate governance | 18 |
Lighting other than cinema | 245 |
Semiconductors | 82 |
| Criminal law | 236 |
Magnetics | 222 |
Social science | 1700 |
| Cultural studies | 358 |
Mammals | 2 |
Sociology | 40 |
| Customs | 122 |
Marketing | 920 |
Sound recording | 173 |
| Data processing | 47 |
Materials science | 1726 |
Statistics | 3364 |
| Demography | 82 |
Mathematics | 2800 |
Sugar production | 14 |
| Earth sciences | 5573 |
Mechanic engineering | 7537 |
Superconductivity | 164 |
| Ecology | 84 |
Medical | 10323 |
Taxes | 418 |
| Economics | 5245 |
Metallurgy | 3170 |
Technology | 3130 |
| Education | 734 |
Mexican | 68 |
Telecommunications | 272 |
| Electric machinery | 118 |
Microsoft | 11015 |
Telegraphy | 273 |
| Electric motors | 367 |
Mineral products | 44 |
Telephony | 116 |
| Electric traction | 316 |
Mining | 11 |
Textile industry | 310 |
| Electricity generation | 358 |
Municipal planning | 414 |
Thermal Energy | 312 |
| Electrochemistry | 20 |
Natural resourses and wildlife conservation | 612 |
Trade unions | 230 |
| Electronics | 15445 |
Natural sciences | 3336 |
Transformers | 111 |
| Employment | 32 |
Nautical | 1 |
Transport | 12876 |
| Energy industry | 1063 |
Nuclear and fusion power | 130 |
Ultrasound | 17 |
| Environment | 6749 |
Nuclear physics | 531 |
United Nations | 308 |
| European Union | 20 |
Obsolete / dated | 315 |
United States | 3 |
| Finances | 9287 |
Oil / petroleum | 57 |
Vacuum tubes | 217 |
| Fish farming pisciculture | 1084 |
Ornithology | 1 |
Video recording | 95 |
| Food industry | 1025 |
Patents | 2973 |
Waste management | 21 |
| Forestry | 683 |
Pharmacy and pharmacology | 737 |
Welding | 71 |
| General | 16304 |
Physical sciences | 417 |
Wind Energy | 37 |
| Geography | 209 |
Physics | 120 |
Wood processing | 38 |
| Government, administration and public services | 139 |
Piezoelectric crystals | 149 |
Work flow | 499 |
