Classification
330 - Economics
109
620 - Engineering & allied operations
49
320 - Political science
48
658 - General management
36
621 - Applied physics
35
340 - Law
29
610 - Medicine & health
29
500 - Natural sciences & mathematics
21
300 - Social sciences
19
384 - Communications; telecommunication
18
332 - Financial economics
17
616 - Diseases
16
333 - Economics of land & energy
14
304 - Factors affecting social behavior
13
006 - Special computer methods
11
629 - Other branches of engineering
11
370 - Education
10
519 - Probabilities & applied mathematics
10
338 - Production
9
004 - Data processing & computer science
8
302 - Social interaction
8
331 - Labor economics
8
670 - Manufacturing
8
363 - Other social problems & services
7
660 - Chemical engineering
7
510 - Mathematics
6
577 - Ecology
6
617 - Surgery & related medical specialties
6
001 - Knowledge
5
910 - Geography & travel
5
003 - Systems
4
005 - Computer programming, programs & data
4
339 - Macroeconomics & related topics
4
364 - Criminology
4
368 - Insurance
4
551 - Geology, hydrology & meteorology
4
613 - Personal health & safety
4
614 - Incidence & prevention of disease
4
630 - Agriculture & related technologies
4
745 - Decorative arts
4
900 - History & geography
4
153 - Mental processes & intelligence
3
170 - Ethics
3
301 - Sociology & anthropology
3
305 - Social groups
3
306 - Culture & institutions
3
336 - Public finance
3
343 - Military, tax, trade & industrial law
3
381 - Commerce
3
600 - Technology
3
more ...