Classification
330 - Economics
337
320 - Political science
55
331 - Labor economics
40
300 - Social sciences
31
340 - Law
20
658 - General management
19
333 - Economics of land & energy
16
700 - The arts; fine & decorative arts
11
361 - Social problems & social welfare in general
9
338 - Production
8
650 - Management & auxiliary services
8
900 - History & geography
8
370 - Education
7
339 - Macroeconomics & related topics
6
380 - Commerce, communications & transportation
6
500 - Natural sciences & mathematics
6
610 - Medicine & health
6
000 - Computer science, information & general works
5
302 - Social interaction
5
363 - Other social problems & services
5
600 - Technology
5
160 - Logic
4
332 - Financial economics
4
362 - Social welfare problems & services
4
006 - Special computer methods
3
100 - Philosophy & psychology
3
140 - Specific philosophical schools
3
304 - Factors affecting social behavior
3
297 - Islam, Babism & Bahai Faith
2
344 - Labor, social, education & cultural law
2
360 - Social problems & services; associations
2
368 - Insurance
2
620 - Engineering & allied operations
2
131 - Parapsychological & occult methods
1
174 - Occupational ethics
1
200 - Religion
1
303 - Social processes
1
335 - Socialism & related systems
1
350 - Public administration & military science
1
366 - Associations
1
371 - Schools & their activities; special education
1
372 - Elementary education
1
381 - Commerce
1
384 - Communications; telecommunication
1
400 - Language
1
410 - Linguistics
1
630 - Agriculture & related technologies
1
670 - Manufacturing
1