Classification
331 - Labor economics
1,330
005 - Computer programming, programs & data
1,088
658 - General management
397
500 - Natural sciences & mathematics
250
374 - Adult education
238
330 - Economics
211
000 - Computer science, information & general works
210
620 - Engineering & allied operations
173
004 - Data processing & computer science
156
384 - Communications; telecommunication
154
338 - Production
142
364 - Criminology
127
300 - Social sciences
60
006 - Special computer methods
43
302 - Social interaction
43
621 - Applied physics
39
363 - Other social problems & services
37
368 - Insurance
34
381 - Commerce
34
670 - Manufacturing
31
745 - Decorative arts
28
332 - Financial economics
17
600 - Technology
13
629 - Other branches of engineering
13
510 - Mathematics
11
001 - Knowledge
10
519 - Probabilities & applied mathematics
10
355 - Military science
7
681 - Precision instruments & other devices
6
025 - Library operations
5
303 - Social processes
5
371 - Schools & their activities; special education
5
530 - Physics
5
153 - Mental processes & intelligence
4
539 - Modern physics
4
660 - Chemical engineering
4
781 - General principles & musical forms
4
158 - Applied psychology
3
352 - General considerations of public administration
3
362 - Social welfare problems & services
3
551 - Geology, hydrology & meteorology
3
610 - Medicine & health
3
628 - Sanitary & municipal engineering
3
650 - Management & auxiliary services
3
651 - Office services
3
011 - Bibliographies
2
305 - Social groups
2
535 - Light & infrared & ultraviolet phenomena
2
537 - Electricity & electronics
2
657 - Accounting
2
more ...