Accounting	1
Accumulators	1
Acoustics	2
Aeronautics	3
Agriculture	70
Animal husbandry	5
Antennas and waveguides	9
Automated equipment	5
Automobiles	12
Banking	3
Baseball	4
Biotechnology	2
Book binding	5
Chemical fibers	1
Chemistry	38
Cinematography	4
Coal	3
Commerce	5
Communications	95
Computers	2
Construction	7
Cultural studies	7
Data processing	9
Drilling	8
Dyalysis	1
Earth sciences	17
Economics	15
Education	6
Electric motors	3
Electric traction	1
Electricity	3
Electricity generation	2
Electronics	68
Energy industry	1
Entomology	4
Environment	7
Finances	69
Fish farming pisciculture	6
Fishery fishing industry	1
Food industry	3
Footwear	1
Forestry	7
General	68
Geography	2
Health care	21
Hobbies and pastimes	4
Horticulture	2
Immigration and citizenship	7
Industry	82
Information technology	57
Insurance	1
International Monetary Fund	17
Labor law	4
Lasers	1
Law	13
Leather	1
Librarianship	19
Life sciences	9
Loading equipment	8
Logistics	1
Marketing	8
Materials science	8
Mathematics	2
Measuring instruments	7
Mechanic engineering	48
Medical	44
Metallurgy	19
Meteorology	16
Mexican	2
Microsoft	15
Military	1
Municipal planning	2
Natural resourses and wildlife conservation	1
Natural sciences	10
Nautical	2
Nuclear and fusion power	1
Nuclear physics	3
Packaging	4
Patents	3
Pest control	3
Piezoelectric crystals	1
Politics	6
Polygraphy	2
Procurement	1
Radio	3
Radiology	1
Rail transport	2
Real estate	4
Remote sensing	4
Skydiving	1
Social science	5
Sociology	1
Spanish	5
Statistics	3
Taxes	2
Technology	101
Telecommunications	1
Telegraphy	4
Textile industry	15
Tools	1
Transport	98
United Nations	6
Veterinary medicine	1
Water resources	2
Weapons and gunsmithing	1
Wood processing	3
Work flow	8