Classification
510 - Mathematics
519 - Probabilities & applied mathematics
105
500 - Natural sciences & mathematics
80
620 - Engineering & allied operations
52
515 - Analysis
46
512 - Algebra
33
511 - General principles of mathematics
29
330 - Economics
28
621 - Applied physics
22
004 - Data processing & computer science
21
006 - Special computer methods
18
658 - General management
18
005 - Computer programming, programs & data
17
331 - Labor economics
13
332 - Financial economics
12
745 - Decorative arts
12
384 - Communications; telecommunication
10
530 - Physics
9
516 - Geometry
8
153 - Mental processes & intelligence
7
514 - Topology
7
000 - Computer science, information & general works
6
001 - Knowledge
4
300 - Social sciences
4
368 - Insurance
4
518 - Numerical analysis
4
003 - Systems
3
302 - Social interaction
3
338 - Production
3
670 - Manufacturing
3
333 - Economics of land & energy
2
371 - Schools & their activities; special education
2
501 - Philosophy & theory
2
616 - Diseases
2
629 - Other branches of engineering
2
681 - Precision instruments & other devices
2
149 - Other philosophical systems
1
150 - Psychology
1
155 - Differential & developmental psychology
1
415 - Grammar
1
523 - Specific celestial bodies & phenomena
1
526 - Mathematical geography
1
531 - Classical mechanics; solid mechanics
1
532 - Fluid mechanics; liquid mechanics
1
533 - Gas mechanics
1
535 - Light & infrared & ultraviolet phenomena
1
536 - Heat
1
537 - Electricity & electronics
1
541 - Physical chemistry
1
542 - Techniques, equipment & materials
1
more ...