Classification
005 - Computer programming, programs & data
1,898
004 - Data processing & computer science
1,503
006 - Special computer methods
946
621 - Applied physics
210
745 - Decorative arts
207
371 - Schools & their activities; special education
120
000 - Computer science, information & general works
92
025 - Library operations
88
003 - Systems
78
500 - Natural sciences & mathematics
74
620 - Engineering & allied operations
66
629 - Other branches of engineering
63
658 - General management
62
610 - Medicine & health
53
040 - [Unassigned]
36
331 - Labor economics
32
381 - Commerce
22
384 - Communications; telecommunication
19
670 - Manufacturing
18
302 - Social interaction
15
370 - Education
14
330 - Economics
13
303 - Social processes
12
794 - Indoor games of skill
10
300 - Social sciences
6
410 - Linguistics
6
338 - Production
5
570 - Life sciences; biology
5
612 - Human physiology
5
374 - Adult education
4
519 - Probabilities & applied mathematics
4
650 - Management & auxiliary services
4
660 - Chemical engineering
4
910 - Geography & travel
4
001 - Knowledge
3
007 - [Unassigned]
3
534 - Sound & related vibrations
3
690 - Buildings
3
020 - Library & information sciences
2
153 - Mental processes & intelligence
2
174 - Occupational ethics
2
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
305 - Social groups
2
306 - Culture & institutions
2
401 - Philosophy & theory
2
510 - Mathematics
2
511 - General principles of mathematics
2
515 - Analysis
2
530 - Physics
2
more ...