Classification
005 - Computer programming, programs & data
70
006 - Special computer methods
39
658 - General management
27
330 - Economics
26
004 - Data processing & computer science
12
500 - Natural sciences & mathematics
10
304 - Factors affecting social behavior
9
331 - Labor economics
9
620 - Engineering & allied operations
9
003 - Systems
8
374 - Adult education
7
616 - Diseases
7
745 - Decorative arts
7
306 - Culture & institutions
6
338 - Production
6
381 - Commerce
6
001 - Knowledge
5
300 - Social sciences
5
610 - Medicine & health
5
621 - Applied physics
5
302 - Social interaction
4
551 - Geology, hydrology & meteorology
4
000 - Computer science, information & general works
3
025 - Library operations
3
320 - Political science
3
333 - Economics of land & energy
3
510 - Mathematics
3
617 - Surgery & related medical specialties
3
327 - International relations
2
340 - Law
2
362 - Social welfare problems & services
2
363 - Other social problems & services
2
371 - Schools & their activities; special education
2
378 - Higher education
2
519 - Probabilities & applied mathematics
2
537 - Electricity & electronics
2
571 - Physiology & related subjects
2
612 - Human physiology
2
629 - Other branches of engineering
2
631 - Techniques, equipment & materials
2
636 - Animal husbandry
2
650 - Management & auxiliary services
2
660 - Chemical engineering
2
670 - Manufacturing
2
910 - Geography & travel
2
951 - China & adjacent areas
2
007 - [Unassigned]
1
020 - Library & information sciences
1
030 - General encyclopedic works
1
040 - [Unassigned]
1
more ...