Classification
006 - Special computer methods
760
005 - Computer programming, programs & data
755
004 - Data processing & computer science
474
330 - Economics
127
371 - Schools & their activities; special education
117
658 - General management
115
300 - Social sciences
78
025 - Library operations
62
303 - Social processes
56
621 - Applied physics
53
381 - Commerce
39
003 - Systems
25
518 - Numerical analysis
18
541 - Physical chemistry
16
301 - Sociology & anthropology
13
519 - Probabilities & applied mathematics
13
610 - Medicine & health
13
620 - Engineering & allied operations
10
500 - Natural sciences & mathematics
8
530 - Physics
8
629 - Other branches of engineering
8
570 - Life sciences; biology
7
650 - Management & auxiliary services
7
511 - General principles of mathematics
6
612 - Human physiology
6
302 - Social interaction
5
320 - Political science
5
501 - Philosophy & theory
5
000 - Computer science, information & general works
4
338 - Production
4
540 - Chemistry & allied sciences
4
670 - Manufacturing
4
794 - Indoor games of skill
4
343 - Military, tax, trade & industrial law
3
370 - Education
3
628 - Sanitary & municipal engineering
3
660 - Chemical engineering
3
001 - Knowledge
2
333 - Economics of land & energy
2
340 - Law
2
341 - Law of nations
2
351 - Public administration
2
363 - Other social problems & services
2
380 - Commerce, communications & transportation
2
510 - Mathematics
2
515 - Analysis
2
520 - Astronomy & allied sciences
2
551 - Geology, hydrology & meteorology
2
571 - Physiology & related subjects
2
600 - Technology
2
more ...