Accounting	15
Acridology	2
Agriculture	225
Animal husbandry	33
Antennas and waveguides	6
Astronautics	6
Automated equipment	36
Automatic control	28
Aviation	4
Banking	3
Biology	1
Biotechnology	4
Botany	4
Business	2
Canada	3
Chemistry	85
Cinematography	3
Climatology	1
Coal	6
Commerce	49
Communications	963
Computer networks	6
Computer numerical control	44
Computers	4
Construction	25
Corporate governance	25
Criminal law	22
Cultural studies	6
Customs	3
Data processing	34
Dyalysis	4
Earth sciences	138
Ecology	2
Economics	172
Education	60
Electric machinery	6
Electric motors	10
Electric traction	1
Electricity generation	4
Electronics	666
Energy industry	63
Environment	225
Finances	373
Fish farming pisciculture	14
Fishery fishing industry	24
Food industry	17
Food service and catering	2
Forestry	30
General	516
Genetics	8
Geography	4
Government, administration and public services	6
Health care	124
Hobbies and pastimes	7
Horticulture	3
Human rights activism	1
Hydrology	1
Hygiene	1
Immigration and citizenship	33
Industry	57
Information technology	864
Insurance	28
International law	1
International Monetary Fund	134
International trade	5
Isolation	1
Labor law	26
Labor organization	9
Laboratory equipment	1
Law	102
Life sciences	73
Lighting other than cinema	2
Loading equipment	20
Magnetics	2
Marketing	23
Materials science	27
Mathematics	12
Measuring instruments	32
Mechanic engineering	125
Mechanics	1
Medical	192
Metallurgy	25
Mexican	18
Microsoft	160
Mineral products	6
Mineralogy	11
Mining	2
Municipal planning	6
Name of organization	223
Natural sciences	88
Navigation	1
Nuclear and fusion power	4
Nuclear physics	39
Obsolete / dated	10
Oil / petroleum	1
Packaging	14
Patents	20
Pest control	5
Pharmacy and pharmacology	17
Physical sciences	5
Physics	3
Piezoelectric crystals	1
Planning	2
Politics	79
Power lines	2
Power system protection	1
Procedural law	1
Pulp and paper industry	6
Radio	19
Rail transport	11
Reliability	10
Religion	4
Remote sensing	14
Research and development	3
Satellite communications	1
Scientific	9
Security systems	3
Social science	47
Sociology	6
Soil science	4
Sound recording	15
Spanish	8
Statistics	98
Taxes	23
Technology	86
Telecommunications	7
Telephony	11
Textile industry	44
Thermal Energy	7
Transport	693
United Nations	194
Veterinary medicine	2
Video recording	2
Water resources	51
Welding	4
Wind Energy	1
Wood processing	1
Work flow	71