Classification
616 - Diseases
127
610 - Medicine & health
37
515 - Analysis
33
510 - Mathematics
31
519 - Probabilities & applied mathematics
30
520 - Astronomy & allied sciences
26
530 - Physics
26
500 - Natural sciences & mathematics
21
620 - Engineering & allied operations
17
617 - Surgery & related medical specialties
16
516 - Geometry
13
621 - Applied physics
13
614 - Incidence & prevention of disease
10
613 - Personal health & safety
9
150 - Psychology
8
511 - General principles of mathematics
8
512 - Algebra
8
612 - Human physiology
8
615 - Pharmacology & therapeutics
7
618 - Gynecology, obstetrics, pediatrics & geriatrics
7
004 - Data processing & computer science
5
539 - Modern physics
5
300 - Social sciences
4
523 - Specific celestial bodies & phenomena
4
531 - Classical mechanics; solid mechanics
4
570 - Life sciences; biology
4
641 - Food & drink
4
664 - Food technology
4
003 - Systems
3
005 - Computer programming, programs & data
3
370 - Education
3
507 - Education, research & related topics
3
509 - Historical, geographic & persons treatment
3
518 - Numerical analysis
3
537 - Electricity & electronics
3
550 - Earth sciences
3
571 - Physiology & related subjects
3
611 - Human anatomy, cytology & histology
3
624 - Civil engineering
3
629 - Other branches of engineering
3
650 - Management & auxiliary services
3
658 - General management
3
808 - Rhetoric & collections of literature
3
001 - Knowledge
2
006 - Special computer methods
2
301 - Sociology & anthropology
2
306 - Culture & institutions
2
330 - Economics
2
338 - Production
2
363 - Other social problems & services
2
more ...