| Subject |
Number of entries |
| Abbreviation |
2 |
| Accounting |
1.533 |
| Accumulators |
179 |
| Agriculture |
35.692 |
| Animal husbandry |
536 |
| Antennas and waveguides |
952 |
| Art |
404 |
| Astronautics |
659 |
| Automatic control |
456 |
| Aviation |
4 |
| Banking |
318 |
| Book binding |
7 |
| Brazil |
3 |
| Business |
312 |
| Cables and cable production |
292 |
| Chemistry |
22.039 |
| Coal |
2.635 |
| Commerce |
2.657 |
| Communications |
28.368 |
| Computer networks |
160 |
| Computers |
54 |
| Construction |
5.149 |
| Corporate governance |
43 |
| Criminal law |
881 |
| Cultural studies |
1.540 |
| Customs |
276 |
| Data processing |
120 |
| Demography |
422 |
| Earth sciences |
17.093 |
| Ecology |
197 |
| Economics |
16.741 |
| Education |
2.824 |
| Electric machinery |
348 |
| Electric motors |
616 |
| Electric traction |
826 |
| Electrical engineering |
333 |
| Electricity generation |
521 |
| Electrochemistry |
106 |
| Electronics |
35.678 |
| Employment |
196 |
| Energy industry |
2.539 |
| Environment |
24.128 |
| European Union |
24 |
| Finances |
25.060 |
| Fish farming pisciculture |
5.100 |
| Food industry |
3.854 |
| Forestry |
2.902 |
| General |
45.186 |
| Geography |
805 |
| Geophysics |
30 |
| Government, administration and public services |
438 |
| Ground forces Army |
6 |
| Health care |
16.014 |
| Hobbies and pastimes |
2.019 |
| Human rights activism |
1.232 |
| Immigration and citizenship |
1.179 |
| Industry |
30.910 |
| Informal |
1 |
| Information technology |
25.336 |
| Insurance |
2.885 |
| International law |
113 |
| International Monetary Fund |
9.024 |
| International trade |
335 |
| Investment |
64 |
| Isolation |
415 |
| Labor law |
3.646 |
| Labor organization |
82 |
| Latin American |
14 |
| Law |
19.749 |
| Leather |
131 |
| Librarianship |
681 |
| Life sciences |
13.594 |
| Lighting other than cinema |
749 |
| Magnetics |
514 |
| Mammals |
73 |
| Marketing |
3.412 |
| Materials science |
4.876 |
| Mathematics |
7.300 |
| Mechanic engineering |
21.951 |
| Medical |
55.592 |
| Metallurgy |
10.779 |
| Metrology |
114 |
| Microsoft |
26.436 |
| Mineral products |
254 |
| Mining |
52 |
| Municipal planning |
1.701 |
| Name of organization |
17 |
| Natural resourses and wildlife conservation |
6.078 |
| Natural sciences |
15.326 |
| Nautical |
2 |
| Navy |
2 |
| Nuclear and fusion power |
342 |
| Nuclear physics |
1.196 |
| Obsolete / dated |
752 |
| Oil / petroleum |
179 |
| Ornithology |
61 |
| Patents |
6.248 |
| Pest control |
4 |
| Pharmacy and pharmacology |
3.086 |
| Philately / stamp collecting |
6 |
| Physical sciences |
1.357 |
| Physics |
234 |
| Piezoelectric crystals |
296 |
| Politics |
3.310 |
| Polymers |
117 |
| Power electronics |
212 |
| Power lines |
614 |
| Power system protection |
401 |
| Printed circuit boards |
30 |
| Private international law |
47 |
| Procedural law |
855 |
| Psychology |
10 |
| Public relations |
11 |
| Radio |
1.484 |
| Radiobiology |
345 |
| Radiolocation |
1 |
| Radiology |
415 |
| Rail transport |
511 |
| Reliability |
359 |
| Religion |
273 |
| Research and development |
409 |
| Risk Management |
48 |
| Satellite communications |
103 |
| School |
22 |
| Scientific |
781 |
| Security systems |
212 |
| Semiconductors |
199 |
| Social science |
5.003 |
| Sociology |
114 |
| Sound recording |
376 |
| Statistics |
8.843 |
| Sugar production |
74 |
| Superconductivity |
397 |
| Taxes |
1.535 |
| Technology |
8.623 |
| Telecommunications |
567 |
| Telegraphy |
584 |
| Telephony |
294 |
| Textile industry |
881 |
| Thermal Energy |
536 |
| Trade unions |
521 |
| Transformers |
213 |
| Transport |
32.099 |
| Ultrasound |
34 |
| United Nations |
531 |
| United States |
27 |
| Vacuum tubes |
385 |
| Video recording |
151 |
| Waste management |
90 |
| Water resources |
1 |
| Welding |
131 |
| Wind Energy |
77 |
| Wood processing |
184 |
| Work flow |
1.643 |
| Total: |
662.340 |
