Classification
001 - Knowledge
4
003 - Systems
17
004 - Data processing & computer science
5
005 - Computer programming, programs & data
10
006 - Special computer methods
10
020 - Library & information sciences
4
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
2
150 - Psychology
4
160 - Logic
1
170 - Ethics
1
300 - Social sciences
70
301 - Sociology & anthropology
7
304 - Factors affecting social behavior
4
324 - The political process
1
330 - Economics
38
332 - Financial economics
1
333 - Economics of land & energy
2
338 - Production
1
363 - Other social problems & services
1
368 - Insurance
5
370 - Education
1
500 - Natural sciences & mathematics
2
501 - Philosophy & theory
3
510 - Mathematics
8
511 - General principles of mathematics
4
512 - Algebra
6
514 - Topology
1
515 - Analysis
15
516 - Geometry
5
518 - Numerical analysis
6
519 - Probabilities & applied mathematics
928
520 - Astronomy & allied sciences
4
530 - Physics
15
541 - Physical chemistry
1
550 - Earth sciences
5
551 - Geology, hydrology & meteorology
3
560 - Paleontology; paleozoology
1
570 - Life sciences; biology
39
610 - Medicine & health
2
613 - Personal health & safety
1
614 - Incidence & prevention of disease
5
616 - Diseases
1
620 - Engineering & allied operations
5
621 - Applied physics
11
624 - Civil engineering
3
629 - Other branches of engineering
3
630 - Agriculture & related technologies
1
650 - Management & auxiliary services
1
658 - General management
6
more ...