Classification
006 - Special computer methods
185
621 - Applied physics
63
004 - Data processing & computer science
21
005 - Computer programming, programs & data
17
610 - Medicine & health
15
519 - Probabilities & applied mathematics
13
620 - Engineering & allied operations
9
515 - Analysis
7
003 - Systems
6
520 - Astronomy & allied sciences
6
629 - Other branches of engineering
5
025 - Library operations
3
570 - Life sciences; biology
3
150 - Psychology
2
330 - Economics
2
331 - Labor economics
2
374 - Adult education
2
510 - Mathematics
2
530 - Physics
2
534 - Sound & related vibrations
2
650 - Management & auxiliary services
2
658 - General management
2
794 - Indoor games of skill
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
384 - Communications; telecommunication
1
500 - Natural sciences & mathematics
1
501 - Philosophy & theory
1
511 - General principles of mathematics
1
512 - Algebra
1
514 - Topology
1
531 - Classical mechanics; solid mechanics
1
535 - Light & infrared & ultraviolet phenomena
1
537 - Electricity & electronics
1
614 - Incidence & prevention of disease
1
634 - Orchards, fruits & forestry
1
670 - Manufacturing
1
770 - Photography, photographs & computer art
1
781 - General principles & musical forms
1
910 - Geography & travel
1