Classification
320 - Political science
84
330 - Economics
44
900 - History & geography
24
340 - Law
19
333 - Economics of land & energy
15
300 - Social sciences
13
338 - Production
12
306 - Culture & institutions
11
200 - Religion
10
301 - Sociology & anthropology
10
363 - Other social problems & services
9
700 - The arts; fine & decorative arts
9
100 - Philosophy & psychology
8
304 - Factors affecting social behavior
8
140 - Specific philosophical schools
6
720 - Architecture
6
327 - International relations
5
336 - Public finance
5
658 - General management
5
305 - Social groups
4
321 - Systems of governments & states
4
339 - Macroeconomics & related topics
4
342 - Constitutional & administrative law
4
370 - Education
4
809 - History, description & criticism
4
930 - History of ancient world to ca. 499
4
000 - Computer science, information & general works
3
297 - Islam, Babism & Bahai Faith
3
302 - Social interaction
3
303 - Social processes
3
331 - Labor economics
3
332 - Financial economics
3
600 - Technology
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
800 - Literature & rhetoric
3
170 - Ethics
2
307 - Communities
2
322 - Relation of state to organized groups
2
323 - Civil & political rights
2
324 - The political process
2
345 - Criminal law
2
351 - Public administration
2
374 - Adult education
2
380 - Commerce, communications & transportation
2
410 - Linguistics
2
500 - Natural sciences & mathematics
2
501 - Philosophy & theory
2
510 - Mathematics
2
551 - Geology, hydrology & meteorology
2
more ...