Classification
330 - Economics
320 - Political science
2,565
300 - Social sciences
509
333 - Economics of land & energy
350
900 - History & geography
350
610 - Medicine & health
337
340 - Law
233
363 - Other social problems & services
197
600 - Technology
187
658 - General management
175
700 - The arts; fine & decorative arts
168
370 - Education
137
304 - Factors affecting social behavior
122
338 - Production
113
380 - Commerce, communications & transportation
113
630 - Agriculture & related technologies
89
000 - Computer science, information & general works
86
140 - Specific philosophical schools
67
332 - Financial economics
61
500 - Natural sciences & mathematics
60
551 - Geology, hydrology & meteorology
59
620 - Engineering & allied operations
58
302 - Social interaction
49
331 - Labor economics
49
381 - Commerce
48
170 - Ethics
44
576 - Genetics & evolution
42
361 - Social problems & social welfare in general
38
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
303 - Social processes
13
384 - Communications; telecommunication
13
001 - Knowledge
12
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 ...