Classification
330 - Economics
658 - General management
381
158 - Applied psychology
242
650 - Management & auxiliary services
238
302 - Social interaction
162
300 - Social sciences
159
150 - Psychology
120
331 - Labor economics
120
153 - Mental processes & intelligence
112
100 - Philosophy & psychology
96
500 - Natural sciences & mathematics
89
384 - Communications; telecommunication
88
338 - Production
66
380 - Commerce, communications & transportation
65
381 - Commerce
64
332 - Financial economics
52
610 - Medicine & health
52
670 - Manufacturing
46
155 - Differential & developmental psychology
42
320 - Political science
42
700 - The arts; fine & decorative arts
41
333 - Economics of land & energy
36
600 - Technology
32
900 - History & geography
32
000 - Computer science, information & general works
28
170 - Ethics
25
363 - Other social problems & services
25
370 - Education
24
140 - Specific philosophical schools
21
620 - Engineering & allied operations
20
339 - Macroeconomics & related topics
18
001 - Knowledge
12
152 - Perception, movement, emotions & drives
12
200 - Religion
12
301 - Sociology & anthropology
12
303 - Social processes
10
780 - Music
10
576 - Genetics & evolution
8
006 - Special computer methods
7
800 - Literature & rhetoric
7
304 - Factors affecting social behavior
6
580 - Plants (Botany)
6
340 - Law
5
410 - Linguistics
5
630 - Agriculture & related technologies
5
720 - Architecture
5
745 - Decorative arts
5
770 - Photography, photographs & computer art
5
400 - Language
4
530 - Physics
4
more ...