| Subject |
Number of entries |
| Accounting |
1.439 |
| Acoustics |
69 |
| Agriculture |
33.473 |
| Animal husbandry |
547 |
| Antennas and waveguides |
2.019 |
| Art |
243 |
| Astronautics |
287 |
| Astronomy |
66 |
| Automated equipment |
3.390 |
| Aviation |
240 |
| Banking |
197 |
| Biology |
11 |
| Book binding |
128 |
| Business |
295 |
| Chemistry |
22.296 |
| Coal |
1.833 |
| Commerce |
1.646 |
| Communications |
25.588 |
| Computer numerical control |
943 |
| Computers |
92 |
| Construction |
7.603 |
| Corporate governance |
42 |
| Criminal law |
629 |
| Cultural studies |
2.290 |
| Customs |
282 |
| Data processing |
160 |
| Demography |
475 |
| Earth sciences |
15.200 |
| Ecology |
117 |
| Economics |
16.479 |
| Education |
3.249 |
| Electronics |
23.972 |
| Employment |
193 |
| Energy industry |
2.129 |
| English |
319 |
| Environment |
16.205 |
| European Union |
72 |
| Finances |
25.055 |
| Fish farming pisciculture |
3.844 |
| Food industry |
3.050 |
| Forestry |
745 |
| General |
42.298 |
| Geography |
653 |
| Geophysics |
28 |
| Government, administration and public services |
621 |
| Health care |
12.289 |
| Hobbies and pastimes |
2.037 |
| Human rights activism |
882 |
| Hydraulics |
1 |
| Ichthyology |
78 |
| Immigration and citizenship |
1.508 |
| Industry |
19.656 |
| Information technology |
24.965 |
| Insurance |
2.945 |
| International law |
113 |
| International trade |
609 |
| Investment |
92 |
| Labor law |
4.540 |
| Labor organization |
67 |
| Latin American |
5 |
| Law |
22.101 |
| Leather |
153 |
| Life sciences |
9.512 |
| Mammals |
58 |
| Marketing |
4.026 |
| Materials science |
5.035 |
| Mathematics |
4.867 |
| Measuring instruments |
3.841 |
| Mechanic engineering |
16.273 |
| Mechanics |
66 |
| Medical appliances |
26 |
| Medical |
61.499 |
| Metallurgy |
11.700 |
| Meteorology |
25 |
| Microsoft |
11.880 |
| Military |
1 |
| Mineral products |
191 |
| Mining |
41 |
| Municipal planning |
1.994 |
| Natural resourses and wildlife conservation |
4.684 |
| Natural sciences |
13.424 |
| Nautical |
2 |
| Navigation |
9 |
| Nuclear and fusion power |
269 |
| Nuclear physics |
679 |
| Obsolete / dated |
662 |
| Oil / petroleum |
209 |
| Optics branch of physics |
10 |
| Ornithology |
59 |
| Patents |
5.986 |
| Pharmacy and pharmacology |
2.800 |
| Physical sciences |
1.487 |
| Physics |
48 |
| Politics |
3.072 |
| Polygraphy |
247 |
| Private international law |
23 |
| Procedural law |
924 |
| Psychology |
5 |
| Public relations |
15 |
| Religion |
274 |
| Research and development |
265 |
| School |
22 |
| Scientific |
820 |
| Security systems |
152 |
| Social science |
4.219 |
| Sociology |
108 |
| Sound recording |
29 |
| Statistics |
7.954 |
| Sugar production |
41 |
| Surveying |
14 |
| Taxes |
1.556 |
| Technology |
5.540 |
| Telecommunications |
2 |
| Textile industry |
600 |
| Trade unions |
287 |
| Transport |
39.288 |
| United Nations |
432 |
| Waste management |
62 |
| Wood processing |
116 |
| Work flow |
1.989 |
| Total: |
581.972 |
