Classification
330 - Economics
320 - Political science
2,571
300 - Social sciences
510
333 - Economics of land & energy
360
900 - History & geography
351
610 - Medicine & health
346
340 - Law
233
363 - Other social problems & services
202
600 - Technology
189
658 - General management
179
700 - The arts; fine & decorative arts
173
370 - Education
138
304 - Factors affecting social behavior
125
338 - Production
116
380 - Commerce, communications & transportation
114
630 - Agriculture & related technologies
90
000 - Computer science, information & general works
86
140 - Specific philosophical schools
67
332 - Financial economics
64
500 - Natural sciences & mathematics
60
551 - Geology, hydrology & meteorology
59
620 - Engineering & allied operations
57
331 - Labor economics
51
302 - Social interaction
49
381 - Commerce
49
170 - Ethics
45
576 - Genetics & evolution
42
361 - Social problems & social welfare in general
39
200 - Religion
35
100 - Philosophy & psychology
30
581 - Specific topics in natural history
30
650 - Management & auxiliary services
28
158 - Applied psychology
26
670 - Manufacturing
26
580 - Plants (Botany)
25
336 - Public finance
24
800 - Literature & rhetoric
23
301 - Sociology & anthropology
15
400 - Language
15
001 - Knowledge
13
303 - Social processes
13
384 - Communications; telecommunication
13
350 - Public administration & military science
12
362 - Social welfare problems & services
11
657 - Accounting
11
720 - Architecture
10
339 - Macroeconomics & related topics
9
360 - Social problems & services; associations
7
364 - Criminology
7
540 - Chemistry & allied sciences
7
more ...