Classification
006 - Special computer methods
724
005 - Computer programming, programs & data
674
004 - Data processing & computer science
564
371 - Schools & their activities; special education
105
658 - General management
102
300 - Social sciences
68
025 - Library operations
60
303 - Social processes
53
621 - Applied physics
50
381 - Commerce
35
330 - Economics
33
541 - Physical chemistry
27
003 - Systems
23
518 - Numerical analysis
18
794 - Indoor games of skill
16
610 - Medicine & health
14
301 - Sociology & anthropology
11
620 - Engineering & allied operations
11
519 - Probabilities & applied mathematics
10
500 - Natural sciences & mathematics
8
570 - Life sciences; biology
8
530 - Physics
7
511 - General principles of mathematics
6
612 - Human physiology
6
320 - Political science
5
501 - Philosophy & theory
5
629 - Other branches of engineering
5
000 - Computer science, information & general works
4
374 - Adult education
4
510 - Mathematics
4
670 - Manufacturing
4
302 - Social interaction
3
338 - Production
3
343 - Military, tax, trade & industrial law
3
572 - Biochemistry
3
615 - Pharmacology & therapeutics
3
001 - Knowledge
2
332 - Financial economics
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
370 - Education
2
380 - Commerce, communications & transportation
2
515 - Analysis
2
516 - Geometry
2
520 - Astronomy & allied sciences
2
551 - Geology, hydrology & meteorology
2
600 - Technology
2
more ...