Accounting	62
Agriculture	159
Animal husbandry	4
Antennas and waveguides	9
Art	1
Automated equipment	26
Aviation	3
Banking	2
Business	13
Canada	3
Chemistry	89
Coal	13
Commerce	25
Communications	217
Computer numerical control	7
Construction	31
Criminal law	10
Cultural studies	23
Customs	2
Demography	3
Earth sciences	62
Economics	200
Education	22
Electronics	221
Employment	1
Energy industry	24
Environment	130
Finances	332
Fish farming pisciculture	7
Food industry	9
Forestry	2
General	1054
Geography	4
Government, administration and public services	8
Health care	56
Hobbies and pastimes	3
Human rights activism	18
Immigration and citizenship	11
Industry	95
Information technology	211
Insurance	80
International trade	16
Investment	1
Labor law	37
Law	361
Life sciences	44
Marketing	46
Materials science	11
Mathematics	70
Measuring instruments	9
Mechanic engineering	28
Mechanics	1
Medical	117
Metallurgy	88
Microsoft	77
Mineral products	5
Mining	1
Municipal planning	8
Natural resourses and wildlife conservation	3
Natural sciences	47
Nuclear and fusion power	3
Nuclear physics	7
Obsolete / dated	1
Patents	85
Pharmacy and pharmacology	42
Physical sciences	5
Politics	42
Private international law	1
Procedural law	14
Religion	1
Research and development	4
Scientific	3
Security systems	4
Social science	48
Statistics	80
Taxes	25
Technology	82
Textile industry	4
Trade unions	3
Transport	217
United Nations	5
Work flow	6
Zoology	1