Classification
330 - Economics
320 - Political science
329
658 - General management
199
333 - Economics of land & energy
96
610 - Medicine & health
87
300 - Social sciences
86
500 - Natural sciences & mathematics
79
600 - Technology
73
340 - Law
72
000 - Computer science, information & general works
68
900 - History & geography
64
338 - Production
63
363 - Other social problems & services
63
700 - The arts; fine & decorative arts
62
302 - Social interaction
60
620 - Engineering & allied operations
59
380 - Commerce, communications & transportation
52
332 - Financial economics
51
670 - Manufacturing
50
304 - Factors affecting social behavior
48
331 - Labor economics
38
381 - Commerce
31
650 - Management & auxiliary services
28
576 - Genetics & evolution
21
551 - Geology, hydrology & meteorology
20
153 - Mental processes & intelligence
19
140 - Specific philosophical schools
18
158 - Applied psychology
18
630 - Agriculture & related technologies
17
370 - Education
16
368 - Insurance
15
384 - Communications; telecommunication
15
580 - Plants (Botany)
14
005 - Computer programming, programs & data
12
581 - Specific topics in natural history
10
004 - Data processing & computer science
9
361 - Social problems & social welfare in general
8
510 - Mathematics
8
170 - Ethics
7
200 - Religion
7
339 - Macroeconomics & related topics
7
100 - Philosophy & psychology
6
336 - Public finance
5
400 - Language
5
540 - Chemistry & allied sciences
5
720 - Architecture
5
800 - Literature & rhetoric
5
006 - Special computer methods
4
150 - Psychology
4
301 - Sociology & anthropology
4
more ...