Classification
530 - Physics
89
539 - Modern physics
86
616 - Diseases
28
621 - Applied physics
22
300 - Social sciences
17
610 - Medicine & health
17
001 - Knowledge
15
330 - Economics
14
700 - The arts; fine & decorative arts
14
004 - Data processing & computer science
13
500 - Natural sciences & mathematics
13
333 - Economics of land & energy
11
571 - Physiology & related subjects
11
523 - Specific celestial bodies & phenomena
10
620 - Engineering & allied operations
8
658 - General management
7
000 - Computer science, information & general works
6
005 - Computer programming, programs & data
6
006 - Special computer methods
6
519 - Probabilities & applied mathematics
6
520 - Astronomy & allied sciences
6
537 - Electricity & electronics
6
570 - Life sciences; biology
6
600 - Technology
6
150 - Psychology
5
338 - Production
5
531 - Classical mechanics; solid mechanics
5
551 - Geology, hydrology & meteorology
5
650 - Management & auxiliary services
5
370 - Education
4
380 - Commerce, communications & transportation
4
501 - Philosophy & theory
4
617 - Surgery & related medical specialties
4
900 - History & geography
4
142 - Critical philosophy
3
515 - Analysis
3
541 - Physical chemistry
3
550 - Earth sciences
3
615 - Pharmacology & therapeutics
3
618 - Gynecology, obstetrics, pediatrics & geriatrics
3
140 - Specific philosophical schools
2
153 - Mental processes & intelligence
2
160 - Logic
2
512 - Algebra
2
535 - Light & infrared & ultraviolet phenomena
2
612 - Human physiology
2
613 - Personal health & safety
2
660 - Chemical engineering
2
745 - Decorative arts
2
003 - Systems
1
more ...