Classification
327 - International relations
156
320 - Political science
53
355 - Military science
18
363 - Other social problems & services
18
330 - Economics
14
500 - Natural sciences & mathematics
10
303 - Social processes
8
364 - Criminology
8
333 - Economics of land & energy
7
658 - General management
7
005 - Computer programming, programs & data
6
341 - Law of nations
6
620 - Engineering & allied operations
6
304 - Factors affecting social behavior
5
338 - Production
5
340 - Law
5
621 - Applied physics
4
900 - History & geography
4
140 - Specific philosophical schools
3
351 - Public administration
3
306 - Culture & institutions
2
323 - Civil & political rights
2
331 - Labor economics
2
352 - General considerations of public administration
2
353 - Specific fields of public administration
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
940 - History of Europe
2
000 - Computer science, information & general works
1
003 - Systems
1
006 - Special computer methods
1
200 - Religion
1
300 - Social sciences
1
301 - Sociology & anthropology
1
302 - Social interaction
1
305 - Social groups
1
324 - The political process
1
336 - Public finance
1
337 - International economics
1
343 - Military, tax, trade & industrial law
1
345 - Criminal law
1
359 - Sea forces & warfare
1
361 - Social problems & social welfare in general
1
368 - Insurance
1
380 - Commerce, communications & transportation
1
407 - Education, research & related topics
1
410 - Linguistics
1
418 - Standard usage & applied linguistics
1
more ...