| Accounting | 54 |
| Agriculture | 553 |
| Animal husbandry | 6 |
| Art | 8 |
| Astronautics | 7 |
| Banking | 1 |
| Business | 20 |
| Chemistry | 264 |
| Coal | 36 |
| Commerce | 74 |
| Communications | 728 |
| Construction | 71 |
| Criminal law | 22 |
| Cultural studies | 34 |
| Customs | 5 |
| Data processing | 2 |
| Demography | 11 |
| Earth sciences | 248 |
| Economics | 546 |
| Education | 85 |
| Electronics | 592 |
| Employment | 4 |
| Energy industry | 64 |
| Environment | 240 |
| European Union | 2 |
| Finances | 1150 |
| Fish farming pisciculture | 61 |
| Food industry | 28 |
| Forestry | 48 |
| General | 736 |
| Government, administration and public services | 12 |
| Health care | 168 |
| Hobbies and pastimes | 15 |
| Human rights activism | 73 |
| Immigration and citizenship | 45 |
| Industry | 366 |
| Information technology | 526 |
| Insurance | 157 |
| International law | 5 |
| International trade | 24 |
| Labor law | 96 |
| Labor organization | 1 |
| Law | 852 |
| Leather | 2 |
| Life sciences | 93 |
| Marketing | 163 |
| Materials science | 183 |
| Mathematics | 7 |
| Mechanic engineering | 217 |
| Medical | 327 |
| Metallurgy | 286 |
| Mexican | 3 |
| Microsoft | 164 |
| Mineral products | 4 |
| Mining | 4 |
| Municipal planning | 7 |
| Natural resourses and wildlife conservation | 11 |
| Natural sciences | 107 |
| Nuclear and fusion power | 2 |
| Nuclear physics | 10 |
| Obsolete / dated | 30 |
| Oil / petroleum | 4 |
| Patents | 25 |
| Pharmacy and pharmacology | 36 |
| Physical sciences | 7 |
| Politics | 162 |
| Private international law | 1 |
| Procedural law | 40 |
| Religion | 5 |
| Research and development | 5 |
| Scientific | 11 |
| Security systems | 14 |
| Social science | 167 |
| Sociology | 9 |
| Statistics | 88 |
| Sugar production | 1 |
| Taxes | 88 |
| Technology | 134 |
| Textile industry | 9 |
| Trade unions | 13 |
| Transport | 1016 |
| United Nations | 19 |
| Waste management | 3 |
| Wood processing | 1 |
| Work flow | 46 |
