Classification
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523 - Specific celestial bodies & phenomena
4
530 - Physics
10
531 - Classical mechanics; solid mechanics
2
532 - Fluid mechanics; liquid mechanics
1
534 - Sound & related vibrations
2
535 - Light & infrared & ultraviolet phenomena
5
536 - Heat
2
537 - Electricity & electronics
4
539 - Modern physics
1
540 - Chemistry & allied sciences
1
541 - Physical chemistry
6
543 - Analytical chemistry
3
550 - Earth sciences
6
551 - Geology, hydrology & meteorology
9
552 - Petrology
1
570 - Life sciences; biology
22
571 - Physiology & related subjects
15
572 - Biochemistry
5
576 - Genetics & evolution
5
577 - Ecology
7
579 - Microorganisms, fungi & algae
1
580 - Plants (Botany)
21
581 - Specific topics in natural history
5
600 - Technology
36
601 - Philosophy & theory
3
610 - Medicine & health
633
612 - Human physiology
11
613 - Personal health & safety
3
614 - Incidence & prevention of disease
4
615 - Pharmacology & therapeutics
8
616 - Diseases
33
617 - Surgery & related medical specialties
16
618 - Gynecology, obstetrics, pediatrics & geriatrics
2
620 - Engineering & allied operations
71
621 - Applied physics
91
623 - Military & nautical engineering
2
624 - Civil engineering
5
627 - Hydraulic engineering
3
628 - Sanitary & municipal engineering
11
629 - Other branches of engineering
37
630 - Agriculture & related technologies
11
641 - Food & drink
1
646 - Sewing, clothing & personal living
1
650 - Management & auxiliary services
11
657 - Accounting
2
658 - General management
243
659 - Advertising & public relations
4
660 - Chemical engineering
12
664 - Food technology
5
667 - Cleaning, color & coating technologies
1
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