Classification
500 - Natural sciences & mathematics
165
510 - Mathematics
69
620 - Engineering & allied operations
53
530 - Physics
44
519 - Probabilities & applied mathematics
32
330 - Economics
27
000 - Computer science, information & general works
25
621 - Applied physics
25
658 - General management
25
331 - Labor economics
19
777 - [Unassigned]
18
537 - Electricity & electronics
12
535 - Light & infrared & ultraviolet phenomena
10
005 - Computer programming, programs & data
9
006 - Special computer methods
8
745 - Decorative arts
8
778 - Fields & kinds of photography
8
781 - General principles & musical forms
8
300 - Social sciences
7
302 - Social interaction
7
770 - Photography, photographs & computer art
7
001 - Knowledge
6
539 - Modern physics
6
004 - Data processing & computer science
5
332 - Financial economics
5
384 - Communications; telecommunication
5
541 - Physical chemistry
5
613 - Personal health & safety
5
670 - Manufacturing
5
791 - Public performances
5
381 - Commerce
4
338 - Production
3
531 - Classical mechanics; solid mechanics
3
538 - Magnetism
3
794 - Indoor games of skill
3
153 - Mental processes & intelligence
2
610 - Medicine & health
2
612 - Human physiology
2
616 - Diseases
2
629 - Other branches of engineering
2
660 - Chemical engineering
2
003 - Systems
1
133 - Specific topics in parapsychology & occultism
1
152 - Perception, movement, emotions & drives
1
158 - Applied psychology
1
303 - Social processes
1
305 - Social groups
1
341 - Law of nations
1
507 - Education, research & related topics
1
511 - General principles of mathematics
1
more ...