Classification
658 - General management
110
302 - Social interaction
55
330 - Economics
54
303 - Social processes
36
300 - Social sciences
26
384 - Communications; telecommunication
26
331 - Labor economics
25
650 - Management & auxiliary services
17
158 - Applied psychology
16
347 - Civil procedure & courts
16
380 - Commerce, communications & transportation
15
153 - Mental processes & intelligence
13
500 - Natural sciences & mathematics
12
340 - Law
11
320 - Political science
9
000 - Computer science, information & general works
8
327 - International relations
8
333 - Economics of land & energy
8
341 - Law of nations
8
150 - Psychology
6
670 - Manufacturing
6
338 - Production
5
152 - Perception, movement, emotions & drives
4
301 - Sociology & anthropology
4
355 - Military science
3
001 - Knowledge
2
140 - Specific philosophical schools
2
610 - Medicine & health
2
616 - Diseases
2
949 - Other parts of Europe
2
100 - Philosophy & psychology
1
201 - Religious mythology & social theology
1
289 - Other denominations & sects
1
305 - Social groups
1
321 - Systems of governments & states
1
328 - The legislative process
1
332 - Financial economics
1
346 - Private law
1
358 - Air & other specialized forces
1
363 - Other social problems & services
1
364 - Criminology
1
368 - Insurance
1
370 - Education
1
371 - Schools & their activities; special education
1
381 - Commerce
1
418 - Standard usage & applied linguistics
1
530 - Physics
1
580 - Plants (Botany)
1
600 - Technology
1
620 - Engineering & allied operations
1
more ...