Accounting	217
Accumulators	15
Acoustics	5
Agriculture	3919
Animal husbandry	37
Antennas and waveguides	356
Art	53
Astronautics	30
Astronomy	573
Automated equipment	335
Automatic control	66
Aviation	42
Banking	183
Bioenergy	28
Biology	1
Biotechnology	10
Book binding	22
Botany	6
Business	53
Cables and cable production	26
Canada	42
Chemistry	2338
Climatology	21
Coal	163
Commerce	284
Communications	4055
Computer numerical control	96
Computers	18
Construction	1016
Corporate governance	86
Criminal law	125
Cultural studies	226
Customs	35
Data processing	10
Demography	100
Dyalysis	40
Earth sciences	2035
Ecology	22
Economics	2124
Education	827
Electric machinery	17
Electric motors	32
Electric traction	68
Electrical engineering	24
Electricity generation	82
Electrochemistry	11
Electronics	3848
Employment	16
Energy industry	408
English	6
Entomology	1
Environment	2050
European Union	51
Finances	3723
Fish farming pisciculture	201
Fishery fishing industry	14
Food industry	195
Food service and catering	20
Forestry	117
General	6125
Genetics	8
Geography	64
Geology	2
Government, administration and public services	100
Health care	1212
Hobbies and pastimes	244
Horticulture	4
Human rights activism	138
Hydrology	12
Ichthyology	28
Immigration and citizenship	281
Industry	1560
Information technology	3853
Insurance	718
International law	26
International trade	130
Investment	23
Isolation	6
Labor law	5169
Labor organization	10
Laboratory equipment	3
Latin American	4
Law	8637
Leather	7
Librarianship	69
Life sciences	1245
Lighting other than cinema	42
Loading equipment	33
Magnetics	48
Mammals	2
Marketing	655
Materials science	602
Mathematics	397
Measuring instruments	436
Mechanic engineering	2049
Mechanics	12
Medical	3443
Metallurgy	2328
Meteorology	1
Metrology	11
Microsoft	1805
Military	1
Milk production	1
Mineral products	46
Mining	4
Municipal planning	274
Name of organization	237
Natural resourses and wildlife conservation	456
Natural sciences	958
Nautical	4
Nuclear and fusion power	21
Nuclear physics	147
Obsolete / dated	60
Oil / petroleum	16
Optics branch of physics	1
Packaging	349
Patents	848
Pest control	12
Pets	1
Pharmacy and pharmacology	167
Physical sciences	146
Physics	33
Piezoelectric crystals	30
Politics	456
Polygraphy	3
Power electronics	19
Power lines	55
Power system protection	59
Printed circuit boards	2
Private international law	11
Procedural law	55
Public relations	1
Radio	119
Radiobiology	18
Radiology	31
Rail transport	64
Reliability	23
Religion	22
Research and development	44
Satellite communications	9
School	2
Scientific	102
Security systems	42
Semiconductors	18
Social science	634
Socialism	2
Sociology	26
Sound recording	39
Statistics	920
Sugar production	6
Surveying	1
Taxes	266
Technology	820
Telecommunications	89
Telegraphy	73
Telephony	27
Textile industry	618
Thermal Energy	78
Trade unions	27
Transformers	27
Transport	5472
United Nations	134
Vacuum tubes	2
Veterinary medicine	8
Video recording	15
Waste management	10
Water resources	152
Welding	17
Wind Energy	5
Wood processing	46
Work flow	271
Zoology	1