Classification
006 - Special computer methods
466
005 - Computer programming, programs & data
219
004 - Data processing & computer science
174
371 - Schools & their activities; special education
68
500 - Natural sciences & mathematics
50
300 - Social sciences
47
621 - Applied physics
39
025 - Library operations
37
620 - Engineering & allied operations
29
303 - Social processes
22
003 - Systems
15
363 - Other social problems & services
15
364 - Criminology
14
530 - Physics
9
381 - Commerce
8
519 - Probabilities & applied mathematics
8
658 - General management
8
570 - Life sciences; biology
7
331 - Labor economics
6
510 - Mathematics
6
001 - Knowledge
5
501 - Philosophy & theory
5
518 - Numerical analysis
5
502 - Miscellany
4
610 - Medicine & health
4
330 - Economics
3
511 - General principles of mathematics
3
541 - Physical chemistry
3
000 - Computer science, information & general works
2
153 - Mental processes & intelligence
2
301 - Sociology & anthropology
2
306 - Culture & institutions
2
531 - Classical mechanics; solid mechanics
2
538 - Magnetism
2
670 - Manufacturing
2
150 - Psychology
1
302 - Social interaction
1
307 - Communities
1
342 - Constitutional & administrative law
1
370 - Education
1
384 - Communications; telecommunication
1
410 - Linguistics
1
509 - Historical, geographic & persons treatment
1
515 - Analysis
1
520 - Astronomy & allied sciences
1
542 - Techniques, equipment & materials
1
548 - Crystallography
1
550 - Earth sciences
1
551 - Geology, hydrology & meteorology
1
601 - Philosophy & theory
1
more ...