Classification
330 - Economics
320 - Political science
3,629
658 - General management
2,101
300 - Social sciences
1,806
670 - Manufacturing
1,622
500 - Natural sciences & mathematics
1,496
302 - Social interaction
1,482
600 - Technology
662
333 - Economics of land & energy
644
338 - Production
577
700 - The arts; fine & decorative arts
510
340 - Law
464
380 - Commerce, communications & transportation
400
900 - History & geography
379
363 - Other social problems & services
369
620 - Engineering & allied operations
347
381 - Commerce
314
331 - Labor economics
310
000 - Computer science, information & general works
258
650 - Management & auxiliary services
216
630 - Agriculture & related technologies
202
610 - Medicine & health
189
384 - Communications; telecommunication
184
158 - Applied psychology
170
332 - Financial economics
137
304 - Factors affecting social behavior
123
153 - Mental processes & intelligence
114
370 - Education
112
140 - Specific philosophical schools
96
576 - Genetics & evolution
71
580 - Plants (Botany)
62
150 - Psychology
58
001 - Knowledge
54
745 - Decorative arts
53
551 - Geology, hydrology & meteorology
52
336 - Public finance
50
800 - Literature & rhetoric
50
368 - Insurance
45
170 - Ethics
44
720 - Architecture
41
581 - Specific topics in natural history
36
006 - Special computer methods
30
100 - Philosophy & psychology
26
540 - Chemistry & allied sciences
24
005 - Computer programming, programs & data
21
657 - Accounting
21
791 - Public performances
21
780 - Music
20
400 - Language
19
004 - Data processing & computer science
17
more ...