Classification
571 - Physiology & related subjects
561
610 - Medicine & health
217
572 - Biochemistry
176
616 - Diseases
130
530 - Physics
122
620 - Engineering & allied operations
106
621 - Applied physics
73
612 - Human physiology
67
570 - Life sciences; biology
62
543 - Analytical chemistry
57
541 - Physical chemistry
37
617 - Surgery & related medical specialties
26
660 - Chemical engineering
25
615 - Pharmacology & therapeutics
20
580 - Plants (Botany)
19
539 - Modern physics
18
000 - Computer science, information & general works
17
006 - Special computer methods
16
333 - Economics of land & energy
14
536 - Heat
14
590 - Animals (Zoology)
14
700 - The arts; fine & decorative arts
14
500 - Natural sciences & mathematics
13
540 - Chemistry & allied sciences
13
547 - Organic chemistry
13
577 - Ecology
12
534 - Sound & related vibrations
11
535 - Light & infrared & ultraviolet phenomena
11
537 - Electricity & electronics
11
576 - Genetics & evolution
10
600 - Technology
10
579 - Microorganisms, fungi & algae
9
630 - Agriculture & related technologies
9
613 - Personal health & safety
8
538 - Magnetism
7
573 - Specific physiological systems in animals
7
003 - Systems
6
004 - Data processing & computer science
6
140 - Specific philosophical schools
6
363 - Other social problems & services
5
551 - Geology, hydrology & meteorology
5
611 - Human anatomy, cytology & histology
5
502 - Miscellany
4
515 - Analysis
4
546 - Inorganic chemistry
4
548 - Crystallography
4
592 - Invertebrates
4
629 - Other branches of engineering
4
519 - Probabilities & applied mathematics
3
531 - Classical mechanics; solid mechanics
3
more ...