Accounting	3
Accumulators	1
Agriculture	55
Antennas and waveguides	10
Astronautics	1
Chemistry	43
Coal	3
Communications	25
Construction	23
Cultural studies	4
Earth sciences	98
Economics	2
Electric machinery	4
Electric motors	2
Electrochemistry	1
Electronics	145
Energy industry	1
Environment	64
Fish farming pisciculture	7
Food industry	1
Forestry	1
General	47
Health care	5
Hobbies and pastimes	5
Industry	123
Information technology	12
Isolation	5
Labor law	5
Law	2
Life sciences	96
Lighting other than cinema	2
Magnetics	3
Marketing	1
Materials science	10
Mathematics	8
Mechanic engineering	59
Medical	33
Metallurgy	104
Metrology	1
Microsoft	10
Mining	1
Municipal planning	2
Natural resourses and wildlife conservation	1
Natural sciences	22
Nuclear physics	8
Patents	2
Physics	1
Piezoelectric crystals	6
Radio	4
Radiology	4
Risk Management	5
Semiconductors	1
Social science	1
Sound recording	4
Statistics	15
Superconductivity	4
Technology	35
Textile industry	4
Thermal Energy	7
Transport	120

surfacing