Classification
650 - Management & auxiliary services
658 - General management
1,029
330 - Economics
675
158 - Applied psychology
363
300 - Social sciences
225
302 - Social interaction
202
331 - Labor economics
158
670 - Manufacturing
156
338 - Production
150
153 - Mental processes & intelligence
136
500 - Natural sciences & mathematics
126
381 - Commerce
69
384 - Communications; telecommunication
68
005 - Computer programming, programs & data
41
380 - Commerce, communications & transportation
35
000 - Computer science, information & general works
32
150 - Psychology
25
006 - Special computer methods
22
320 - Political science
22
170 - Ethics
16
001 - Knowledge
15
620 - Engineering & allied operations
15
657 - Accounting
10
745 - Decorative arts
10
332 - Financial economics
8
610 - Medicine & health
8
004 - Data processing & computer science
7
155 - Differential & developmental psychology
7
600 - Technology
6
700 - The arts; fine & decorative arts
6
174 - Occupational ethics
5
333 - Economics of land & energy
5
340 - Law
5
361 - Social problems & social welfare in general
5
640 - Home & family management
5
800 - Literature & rhetoric
5
152 - Perception, movement, emotions & drives
4
303 - Social processes
3
659 - Advertising & public relations
3
304 - Factors affecting social behavior
2
339 - Macroeconomics & related topics
2
350 - Public administration & military science
2
363 - Other social problems & services
2
364 - Criminology
2
368 - Insurance
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
639 - Hunting, fishing & conservation
2
740 - Drawing & decorative arts
2
808 - Rhetoric & collections of literature
2
more ...