Classification
570 - Life sciences; biology
73
616 - Diseases
24
006 - Special computer methods
22
571 - Physiology & related subjects
16
003 - Systems
10
610 - Medicine & health
10
519 - Probabilities & applied mathematics
9
572 - Biochemistry
9
612 - Human physiology
9
004 - Data processing & computer science
8
577 - Ecology
8
500 - Natural sciences & mathematics
6
515 - Analysis
6
620 - Engineering & allied operations
6
001 - Knowledge
5
005 - Computer programming, programs & data
5
615 - Pharmacology & therapeutics
4
629 - Other branches of engineering
4
636 - Animal husbandry
4
000 - Computer science, information & general works
3
300 - Social sciences
3
330 - Economics
3
518 - Numerical analysis
3
530 - Physics
3
551 - Geology, hydrology & meteorology
3
579 - Microorganisms, fungi & algae
3
580 - Plants (Botany)
3
617 - Surgery & related medical specialties
3
621 - Applied physics
3
150 - Psychology
2
155 - Differential & developmental psychology
2
331 - Labor economics
2
380 - Commerce, communications & transportation
2
401 - Philosophy & theory
2
510 - Mathematics
2
573 - Specific physiological systems in animals
2
576 - Genetics & evolution
2
600 - Technology
2
660 - Chemical engineering
2
153 - Mental processes & intelligence
1
301 - Sociology & anthropology
1
320 - Political science
1
333 - Economics of land & energy
1
338 - Production
1
340 - Law
1
363 - Other social problems & services
1
370 - Education
1
501 - Philosophy & theory
1
512 - Algebra
1
535 - Light & infrared & ultraviolet phenomena
1
more ...