Accounting	75
Agriculture	3391
Animal husbandry	8
Antennas and waveguides	2
Art	8
Astronautics	26
Astronomy	19
Automated equipment	1
Banking	8
Book binding	3
Business	14
Chemistry	1559
Coal	223
Commerce	77
Communications	2126
Computer numerical control	5
Construction	648
Corporate governance	2
Criminal law	33
Cultural studies	184
Customs	6
Data processing	5
Demography	18
Earth sciences	1522
Ecology	8
Economics	618
Education	85
Electric traction	7
Electronics	3228
Employment	23
Energy industry	235
Environment	650
European Union	6
Finances	1654
Fish farming pisciculture	217
Food industry	63
Footwear	16
Forestry	25
General	2360
Geography	1
Geophysics	1
Government, administration and public services	49
Ground forces Army	2
Health care	407
Hobbies and pastimes	131
Human rights activism	37
Immigration and citizenship	86
Industry	2198
Information technology	2070
Insurance	212
International law	3
International trade	69
Investment	6
Labor law	249
Labor organization	4
Law	1109
Leather	6
Life sciences	448
Loading equipment	1
Marketing	281
Materials science	689
Mathematics	143
Measuring instruments	9
Mechanic engineering	3224
Medical	1090
Metallurgy	1367
Microsoft	154
Mineral products	15
Mining	5
Municipal planning	329
Natural resourses and wildlife conservation	88
Natural sciences	510
Nuclear and fusion power	28
Nuclear physics	79
Obsolete / dated	10
Oil / petroleum	10
Patents	27
Pharmacy and pharmacology	45
Physical sciences	70
Physics	1
Politics	121
Power lines	2
Procedural law	42
Public relations	2
Radio	2
Rail transport	1
Religion	6
Research and development	12
Satellite communications	3
Scientific	56
Security systems	11
Social science	181
Sociology	11
Statistics	284
Sugar production	2
Taxes	89
Technology	675
Textile industry	41
Trade unions	7
Transport	4497
United Nations	26
Waste management	4
Wood processing	13
Work flow	83