Classification
570 - Life sciences; biology
282
519 - Probabilities & applied mathematics
112
515 - Analysis
58
571 - Physiology & related subjects
55
003 - Systems
46
610 - Medicine & health
37
577 - Ecology
28
530 - Physics
22
576 - Genetics & evolution
20
006 - Special computer methods
18
612 - Human physiology
17
518 - Numerical analysis
14
616 - Diseases
13
621 - Applied physics
13
004 - Data processing & computer science
12
572 - Biochemistry
12
620 - Engineering & allied operations
11
630 - Agriculture & related technologies
9
516 - Geometry
7
330 - Economics
6
614 - Incidence & prevention of disease
6
629 - Other branches of engineering
6
300 - Social sciences
4
510 - Mathematics
4
535 - Light & infrared & ultraviolet phenomena
4
005 - Computer programming, programs & data
3
150 - Psychology
3
304 - Factors affecting social behavior
3
511 - General principles of mathematics
3
512 - Algebra
3
541 - Physical chemistry
3
615 - Pharmacology & therapeutics
3
660 - Chemical engineering
3
001 - Knowledge
2
333 - Economics of land & energy
2
514 - Topology
2
579 - Microorganisms, fungi & algae
2
590 - Animals (Zoology)
2
634 - Orchards, fruits & forestry
2
658 - General management
2
301 - Sociology & anthropology
1
320 - Political science
1
500 - Natural sciences & mathematics
1
501 - Philosophy & theory
1
540 - Chemistry & allied sciences
1
547 - Organic chemistry
1
550 - Earth sciences
1
560 - Paleontology; paleozoology
1
580 - Plants (Botany)
1
591 - Specific topics in natural history
1
more ...