Classification
330 - Economics
380 - Commerce, communications & transportation
300 - Social sciences
55
658 - General management
50
384 - Communications; telecommunication
49
302 - Social interaction
33
333 - Economics of land & energy
22
320 - Political science
17
363 - Other social problems & services
16
600 - Technology
16
700 - The arts; fine & decorative arts
15
000 - Computer science, information & general works
12
500 - Natural sciences & mathematics
12
331 - Labor economics
9
340 - Law
9
900 - History & geography
9
551 - Geology, hydrology & meteorology
8
610 - Medicine & health
8
620 - Engineering & allied operations
8
650 - Management & auxiliary services
8
670 - Manufacturing
8
140 - Specific philosophical schools
7
630 - Agriculture & related technologies
7
370 - Education
6
338 - Production
5
150 - Psychology
4
170 - Ethics
4
580 - Plants (Botany)
4
720 - Architecture
4
153 - Mental processes & intelligence
3
158 - Applied psychology
3
100 - Philosophy & psychology
2
155 - Differential & developmental psychology
2
200 - Religion
2
301 - Sociology & anthropology
2
381 - Commerce
2
576 - Genetics & evolution
2
581 - Specific topics in natural history
2
659 - Advertising & public relations
2
800 - Literature & rhetoric
2
808 - Rhetoric & collections of literature
2
001 - Knowledge
1
174 - Occupational ethics
1
303 - Social processes
1
304 - Factors affecting social behavior
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
550 - Earth sciences
1
612 - Human physiology
1
615 - Pharmacology & therapeutics
1
more ...