Classification
300 - Social sciences
330 - Economics
380 - Commerce, communications & transportation
384 - Communications; telecommunication
121
658 - General management
118
302 - Social interaction
101
500 - Natural sciences & mathematics
61
670 - Manufacturing
57
331 - Labor economics
25
000 - Computer science, information & general works
15
320 - Political science
15
338 - Production
13
600 - Technology
13
900 - History & geography
13
650 - Management & auxiliary services
11
700 - The arts; fine & decorative arts
11
340 - Law
9
370 - Education
8
620 - Engineering & allied operations
8
153 - Mental processes & intelligence
7
381 - Commerce
7
400 - Language
7
301 - Sociology & anthropology
6
363 - Other social problems & services
6
100 - Philosophy & psychology
5
200 - Religion
5
333 - Economics of land & energy
5
808 - Rhetoric & collections of literature
5
140 - Specific philosophical schools
4
150 - Psychology
4
158 - Applied psychology
4
410 - Linguistics
4
780 - Music
4
800 - Literature & rhetoric
4
303 - Social processes
3
610 - Medicine & health
3
006 - Special computer methods
2
155 - Differential & developmental psychology
2
170 - Ethics
2
304 - Factors affecting social behavior
2
630 - Agriculture & related technologies
2
659 - Advertising & public relations
2
152 - Perception, movement, emotions & drives
1
174 - Occupational ethics
1
297 - Islam, Babism & Bahai Faith
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
657 - Accounting
1
more ...