| Accounting | 48 |
| Agriculture | 783 |
| Animal husbandry | 1 |
| Art | 19 |
| Astronautics | 16 |
| Banking | 10 |
| Brazil | 77 |
| Business | 10 |
| Chemistry | 350 |
| Coal | 85 |
| Commerce | 111 |
| Communications | 707 |
| Construction | 125 |
| Criminal law | 55 |
| Cultural studies | 53 |
| Customs | 9 |
| Data processing | 2 |
| Demography | 9 |
| Earth sciences | 263 |
| Ecology | 2 |
| Economics | 620 |
| Education | 130 |
| Electronics | 670 |
| Employment | 21 |
| Energy industry | 103 |
| Environment | 663 |
| Finances | 1270 |
| Fish farming pisciculture | 96 |
| Food industry | 35 |
| Forestry | 10 |
| General | 1449 |
| Geography | 1 |
| Government, administration and public services | 5 |
| Health care | 301 |
| Hobbies and pastimes | 27 |
| Human rights activism | 129 |
| Immigration and citizenship | 57 |
| Industry | 617 |
| Information technology | 457 |
| Insurance | 130 |
| International law | 6 |
| International trade | 17 |
| Labor law | 156 |
| Law | 1178 |
| Leather | 5 |
| Life sciences | 140 |
| Marketing | 161 |
| Materials science | 121 |
| Mathematics | 51 |
| Mechanic engineering | 337 |
| Medical | 319 |
| Metallurgy | 337 |
| Microsoft | 133 |
| Mineral products | 16 |
| Mining | 1 |
| Municipal planning | 30 |
| Natural resourses and wildlife conservation | 7 |
| Natural sciences | 149 |
| Nuclear and fusion power | 5 |
| Nuclear physics | 30 |
| Obsolete / dated | 60 |
| Oil / petroleum | 5 |
| Patents | 20 |
| Pharmacy and pharmacology | 42 |
| Physical sciences | 11 |
| Politics | 196 |
| Private international law | 3 |
| Procedural law | 31 |
| Religion | 9 |
| Research and development | 29 |
| Scientific | 11 |
| Security systems | 7 |
| Social science | 293 |
| Sociology | 8 |
| Statistics | 124 |
| Sugar production | 1 |
| Taxes | 77 |
| Technology | 201 |
| Textile industry | 9 |
| Trade unions | 14 |
| Transport | 919 |
| United Nations | 45 |
| Work flow | 33 |
