Classification
004 - Data processing & computer science
1,788
005 - Computer programming, programs & data
1,754
006 - Special computer methods
870
621 - Applied physics
214
371 - Schools & their activities; special education
119
025 - Library operations
87
629 - Other branches of engineering
66
610 - Medicine & health
55
003 - Systems
45
620 - Engineering & allied operations
45
303 - Social processes
44
658 - General management
29
670 - Manufacturing
16
370 - Education
15
381 - Commerce
15
330 - Economics
7
410 - Linguistics
7
570 - Life sciences; biology
5
745 - Decorative arts
5
780 - Music
5
300 - Social sciences
4
519 - Probabilities & applied mathematics
4
612 - Human physiology
4
650 - Management & auxiliary services
4
660 - Chemical engineering
4
794 - Indoor games of skill
4
020 - Library & information sciences
3
500 - Natural sciences & mathematics
3
534 - Sound & related vibrations
3
690 - Buildings
3
000 - Computer science, information & general works
2
001 - Knowledge
2
174 - Occupational ethics
2
301 - Sociology & anthropology
2
302 - Social interaction
2
304 - Factors affecting social behavior
2
305 - Social groups
2
306 - Culture & institutions
2
363 - Other social problems & services
2
374 - Adult education
2
401 - Philosophy & theory
2
511 - General principles of mathematics
2
515 - Analysis
2
530 - Physics
2
600 - Technology
2
616 - Diseases
2
808 - Rhetoric & collections of literature
2
910 - Geography & travel
2
140 - Specific philosophical schools
1
150 - Psychology
1
more ...