Classification
500 - Natural sciences & mathematics
330 - Economics
27
510 - Mathematics
20
620 - Engineering & allied operations
19
658 - General management
12
320 - Political science
11
331 - Labor economics
11
005 - Computer programming, programs & data
10
300 - Social sciences
9
302 - Social interaction
8
670 - Manufacturing
7
004 - Data processing & computer science
6
519 - Probabilities & applied mathematics
6
000 - Computer science, information & general works
5
003 - Systems
5
520 - Astronomy & allied sciences
4
006 - Special computer methods
3
363 - Other social problems & services
3
384 - Communications; telecommunication
3
153 - Mental processes & intelligence
2
332 - Financial economics
2
333 - Economics of land & energy
2
530 - Physics
2
537 - Electricity & electronics
2
570 - Life sciences; biology
2
571 - Physiology & related subjects
2
572 - Biochemistry
2
600 - Technology
2
610 - Medicine & health
2
700 - The arts; fine & decorative arts
2
001 - Knowledge
1
150 - Psychology
1
158 - Applied psychology
1
303 - Social processes
1
310 - Collections of general statistics
1
338 - Production
1
368 - Insurance
1
380 - Commerce, communications & transportation
1
400 - Language
1
501 - Philosophy & theory
1
526 - Mathematical geography
1
531 - Classical mechanics; solid mechanics
1
534 - Sound & related vibrations
1
576 - Genetics & evolution
1
624 - Civil engineering
1
629 - Other branches of engineering
1
650 - Management & auxiliary services
1
660 - Chemical engineering
1
745 - Decorative arts
1
780 - Music
1
more ...