Classification
005 - Computer programming, programs & data
793
004 - Data processing & computer science
744
303 - Social processes
223
006 - Special computer methods
202
371 - Schools & their activities; special education
41
621 - Applied physics
33
003 - Systems
24
381 - Commerce
24
658 - General management
20
025 - Library operations
14
610 - Medicine & health
14
300 - Social sciences
13
620 - Engineering & allied operations
13
000 - Computer science, information & general works
10
343 - Military, tax, trade & industrial law
9
302 - Social interaction
8
320 - Political science
7
301 - Sociology & anthropology
6
020 - Library & information sciences
5
330 - Economics
5
650 - Management & auxiliary services
5
323 - Civil & political rights
4
306 - Culture & institutions
3
332 - Financial economics
3
338 - Production
3
341 - Law of nations
3
351 - Public administration
3
374 - Adult education
3
629 - Other branches of engineering
3
340 - Law
2
342 - Constitutional & administrative law
2
601 - Philosophy & theory
2
040 - [Unassigned]
1
153 - Mental processes & intelligence
1
170 - Ethics
1
174 - Occupational ethics
1
200 - Religion
1
304 - Factors affecting social behavior
1
327 - International relations
1
333 - Economics of land & energy
1
339 - Macroeconomics & related topics
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
407 - Education, research & related topics
1
500 - Natural sciences & mathematics
1
509 - Historical, geographic & persons treatment
1
518 - Numerical analysis
1
519 - Probabilities & applied mathematics
1
530 - Physics
1
more ...