Aerohydrodynamics	1
Agriculture	3
Astronautics	4
Automated equipment	1
Aviation	41
Chemistry	3
Construction	5
Electrical engineering	2
Electronics	3
Food industry	4
Forestry	4
General	3
Geology	83
Hydraulic engineering	4
Information technology	1
Mathematics	8
Mechanic engineering	1
Medical appliances	1
Metallurgy	4
Military	16
Mining	1
Natural resourses and wildlife conservation	6
Nuclear physics	1
Oil and gas	1
Oil and gas technology	12
Packaging	22
Polygraphy	2
Radio	2
Technology	46
Textile industry	33
Trucks/Lorries	2
World war II	10

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