Classification
006 - Special computer methods
1,058
004 - Data processing & computer science
318
005 - Computer programming, programs & data
267
621 - Applied physics
154
610 - Medicine & health
53
003 - Systems
43
629 - Other branches of engineering
29
519 - Probabilities & applied mathematics
19
620 - Engineering & allied operations
17
910 - Geography & travel
16
570 - Life sciences; biology
11
001 - Knowledge
10
518 - Numerical analysis
9
616 - Diseases
9
025 - Library operations
8
516 - Geometry
7
530 - Physics
6
333 - Economics of land & energy
5
371 - Schools & their activities; special education
4
515 - Analysis
4
612 - Human physiology
4
510 - Mathematics
3
658 - General management
3
670 - Manufacturing
3
100 - Philosophy & psychology
2
330 - Economics
2
374 - Adult education
2
520 - Astronomy & allied sciences
2
617 - Surgery & related medical specialties
2
650 - Management & auxiliary services
2
770 - Photography, photographs & computer art
2
794 - Indoor games of skill
2
040 - [Unassigned]
1
128 - Humankind
1
150 - Psychology
1
153 - Mental processes & intelligence
1
300 - Social sciences
1
301 - Sociology & anthropology
1
302 - Social interaction
1
331 - Labor economics
1
343 - Military, tax, trade & industrial law
1
363 - Other social problems & services
1
381 - Commerce
1
500 - Natural sciences & mathematics
1
501 - Philosophy & theory
1
511 - General principles of mathematics
1
512 - Algebra
1
514 - Topology
1
543 - Analytical chemistry
1
550 - Earth sciences
1
more ...