Classification
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501 - Philosophy & theory
2
502 - Miscellany
1
507 - Education, research & related topics
1
509 - Historical, geographic & persons treatment
6
510 - Mathematics
13
511 - General principles of mathematics
9
512 - Algebra
8
514 - Topology
2
515 - Analysis
11
516 - Geometry
7
518 - Numerical analysis
1
519 - Probabilities & applied mathematics
19
520 - Astronomy & allied sciences
1
523 - Specific celestial bodies & phenomena
1
530 - Physics
15
531 - Classical mechanics; solid mechanics
3
532 - Fluid mechanics; liquid mechanics
1
534 - Sound & related vibrations
1
535 - Light & infrared & ultraviolet phenomena
3
536 - Heat
2
537 - Electricity & electronics
2
539 - Modern physics
2
541 - Physical chemistry
2
543 - Analytical chemistry
2
547 - Organic chemistry
3
550 - Earth sciences
3
551 - Geology, hydrology & meteorology
14
560 - Paleontology; paleozoology
4
570 - Life sciences; biology
22
571 - Physiology & related subjects
8
572 - Biochemistry
4
576 - Genetics & evolution
4
577 - Ecology
6
579 - Microorganisms, fungi & algae
9
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
599 - Mammals
1
600 - Technology
4
601 - Philosophy & theory
1
602 - Miscellany
1
610 - Medicine & health
13
612 - Human physiology
4
613 - Personal health & safety
2
614 - Incidence & prevention of disease
2
615 - Pharmacology & therapeutics
3
616 - Diseases
30
617 - Surgery & related medical specialties
19
618 - Gynecology, obstetrics, pediatrics & geriatrics
4
620 - Engineering & allied operations
46
621 - Applied physics
40
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