Classification
004 - Data processing & computer science
978
006 - Special computer methods
770
005 - Computer programming, programs & data
615
541 - Physical chemistry
89
371 - Schools & their activities; special education
75
658 - General management
69
621 - Applied physics
58
025 - Library operations
56
303 - Social processes
36
300 - Social sciences
33
003 - Systems
25
518 - Numerical analysis
24
620 - Engineering & allied operations
19
794 - Indoor games of skill
17
381 - Commerce
16
374 - Adult education
15
519 - Probabilities & applied mathematics
15
610 - Medicine & health
14
570 - Life sciences; biology
13
650 - Management & auxiliary services
12
629 - Other branches of engineering
11
330 - Economics
10
540 - Chemistry & allied sciences
10
547 - Organic chemistry
9
500 - Natural sciences & mathematics
8
910 - Geography & travel
8
363 - Other social problems & services
7
530 - Physics
7
340 - Law
6
543 - Analytical chemistry
6
572 - Biochemistry
6
615 - Pharmacology & therapeutics
6
660 - Chemical engineering
6
670 - Manufacturing
6
501 - Philosophy & theory
5
502 - Miscellany
5
510 - Mathematics
5
000 - Computer science, information & general works
4
301 - Sociology & anthropology
4
539 - Modern physics
4
551 - Geology, hydrology & meteorology
4
628 - Sanitary & municipal engineering
4
302 - Social interaction
3
333 - Economics of land & energy
3
336 - Public finance
3
370 - Education
3
001 - Knowledge
2
320 - Political science
2
332 - Financial economics
2
338 - Production
2
more ...