Classification
650 - Management & auxiliary services
330 - Economics
1,516
658 - General management
1,474
158 - Applied psychology
996
331 - Labor economics
381
302 - Social interaction
374
338 - Production
341
153 - Mental processes & intelligence
328
300 - Social sciences
325
381 - Commerce
170
500 - Natural sciences & mathematics
144
670 - Manufacturing
144
384 - Communications; telecommunication
121
000 - Computer science, information & general works
106
380 - Commerce, communications & transportation
67
150 - Psychology
57
170 - Ethics
50
005 - Computer programming, programs & data
40
332 - Financial economics
37
006 - Special computer methods
34
001 - Knowledge
28
800 - Literature & rhetoric
27
620 - Engineering & allied operations
23
155 - Differential & developmental psychology
21
174 - Occupational ethics
19
745 - Decorative arts
15
011 - Bibliographies
14
004 - Data processing & computer science
12
152 - Perception, movement, emotions & drives
12
659 - Advertising & public relations
11
303 - Social processes
10
333 - Economics of land & energy
10
600 - Technology
10
700 - The arts; fine & decorative arts
10
339 - Macroeconomics & related topics
8
510 - Mathematics
7
304 - Factors affecting social behavior
6
320 - Political science
6
580 - Plants (Botany)
5
657 - Accounting
5
363 - Other social problems & services
4
576 - Genetics & evolution
4
640 - Home & family management
4
808 - Rhetoric & collections of literature
4
020 - Library & information sciences
3
371 - Schools & their activities; special education
3
374 - Adult education
3
395 - Etiquette (Manners)
3
519 - Probabilities & applied mathematics
3
610 - Medicine & health
3
more ...