Classification
330 - Economics
787
320 - Political science
420
658 - General management
282
300 - Social sciences
270
340 - Law
212
900 - History & geography
150
616 - Diseases
120
650 - Management & auxiliary services
119
780 - Music
106
332 - Financial economics
102
620 - Engineering & allied operations
87
621 - Applied physics
78
306 - Culture & institutions
64
004 - Data processing & computer science
62
610 - Medicine & health
57
370 - Education
50
530 - Physics
49
302 - Social interaction
48
301 - Sociology & anthropology
47
338 - Production
42
304 - Factors affecting social behavior
37
005 - Computer programming, programs & data
36
158 - Applied psychology
36
700 - The arts; fine & decorative arts
35
333 - Economics of land & energy
34
510 - Mathematics
34
617 - Surgery & related medical specialties
33
305 - Social groups
32
346 - Private law
31
150 - Psychology
30
629 - Other branches of engineering
30
006 - Special computer methods
29
343 - Military, tax, trade & industrial law
27
363 - Other social problems & services
27
657 - Accounting
27
500 - Natural sciences & mathematics
25
551 - Geology, hydrology & meteorology
23
519 - Probabilities & applied mathematics
22
362 - Social welfare problems & services
21
400 - Language
21
624 - Civil engineering
21
327 - International relations
19
371 - Schools & their activities; special education
19
100 - Philosophy & psychology
18
307 - Communities
18
341 - Law of nations
18
410 - Linguistics
18
800 - Literature & rhetoric
18
820 - English & Old English literatures
17
200 - Religion
16
more ...