| Subject |
Number of entries |
| Abbreviation |
2 |
| Accounting |
1.529 |
| Accumulators |
178 |
| Agriculture |
35.364 |
| Animal husbandry |
535 |
| Antennas and waveguides |
952 |
| Art |
395 |
| Astronautics |
659 |
| Automatic control |
456 |
| Aviation |
4 |
| Banking |
318 |
| Book binding |
7 |
| Brazil |
3 |
| Business |
311 |
| Cables and cable production |
292 |
| Chemistry |
21.986 |
| Coal |
2.615 |
| Commerce |
2.645 |
| Communications |
28.248 |
| Computer networks |
160 |
| Computers |
53 |
| Construction |
5.126 |
| Corporate governance |
43 |
| Criminal law |
880 |
| Cultural studies |
1.536 |
| Customs |
276 |
| Data processing |
120 |
| Demography |
417 |
| Earth sciences |
17.056 |
| Ecology |
197 |
| Economics |
16.696 |
| Education |
2.799 |
| Electric machinery |
348 |
| Electric motors |
614 |
| Electric traction |
823 |
| Electrical engineering |
333 |
| Electricity generation |
521 |
| Electrochemistry |
106 |
| Electronics |
35.597 |
| Employment |
196 |
| Energy industry |
2.525 |
| Environment |
23.897 |
| European Union |
24 |
| Finances |
24.971 |
| Fish farming pisciculture |
5.067 |
| Food industry |
3.846 |
| Forestry |
2.855 |
| General |
44.889 |
| Geography |
801 |
| Geophysics |
30 |
| Government, administration and public services |
434 |
| Ground forces Army |
6 |
| Health care |
15.938 |
| Hobbies and pastimes |
2.016 |
| Human rights activism |
1.185 |
| Immigration and citizenship |
1.142 |
| Industry |
30.743 |
| Informal |
1 |
| Information technology |
25.202 |
| Insurance |
2.874 |
| International law |
107 |
| International Monetary Fund |
9.009 |
| International trade |
333 |
| Investment |
64 |
| Isolation |
413 |
| Labor law |
3.623 |
| Labor organization |
82 |
| Latin American |
14 |
| Law |
19.622 |
| Leather |
131 |
| Librarianship |
681 |
| Life sciences |
13.555 |
| Lighting other than cinema |
749 |
| Magnetics |
514 |
| Mammals |
73 |
| Marketing |
3.393 |
| Materials science |
4.857 |
| Mathematics |
7.205 |
| Mechanic engineering |
21.757 |
| Medical |
55.410 |
| Metallurgy |
10.761 |
| Metrology |
114 |
| Microsoft |
26.286 |
| Mineral products |
244 |
| Mining |
52 |
| Municipal planning |
1.692 |
| Name of organization |
17 |
| Natural resourses and wildlife conservation |
6.034 |
| Natural sciences |
15.226 |
| Nautical |
2 |
| Navy |
2 |
| Nuclear and fusion power |
340 |
| Nuclear physics |
1.188 |
| Obsolete / dated |
747 |
| Oil / petroleum |
177 |
| Ornithology |
61 |
| Patents |
6.136 |
| Pest control |
4 |
| Pharmacy and pharmacology |
3.080 |
| Philately / stamp collecting |
6 |
| Physical sciences |
1.348 |
| Physics |
229 |
| Piezoelectric crystals |
296 |
| Politics |
3.291 |
| Polymers |
117 |
| Power electronics |
212 |
| Power lines |
613 |
| Power system protection |
401 |
| Printed circuit boards |
30 |
| Private international law |
47 |
| Procedural law |
841 |
| Psychology |
10 |
| Public relations |
11 |
| Radio |
1.479 |
| Radiobiology |
345 |
| Radiolocation |
1 |
| Radiology |
412 |
| Rail transport |
509 |
| Reliability |
356 |
| Religion |
272 |
| Research and development |
406 |
| Risk Management |
48 |
| Satellite communications |
102 |
| School |
22 |
| Scientific |
778 |
| Security systems |
212 |
| Semiconductors |
199 |
| Social science |
4.970 |
| Sociology |
114 |
| Sound recording |
372 |
| Statistics |
8.757 |
| Sugar production |
74 |
| Superconductivity |
396 |
| Taxes |
1.525 |
| Technology |
8.599 |
| Telecommunications |
565 |
| Telegraphy |
584 |
| Telephony |
294 |
| Textile industry |
879 |
| Thermal Energy |
535 |
| Trade unions |
517 |
| Transformers |
213 |
| Transport |
31.891 |
| Ultrasound |
34 |
| United Nations |
523 |
| 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 |
1.640 |
| Total: |
658.718 |
