Classification
330 - Economics
380 - Commerce, communications & transportation
658 - General management
300 - Social sciences
39
384 - Communications; telecommunication
39
302 - Social interaction
26
331 - Labor economics
8
500 - Natural sciences & mathematics
8
670 - Manufacturing
8
650 - Management & auxiliary services
6
363 - Other social problems & services
4
153 - Mental processes & intelligence
3
158 - Applied psychology
3
338 - Production
3
370 - Education
3
551 - Geology, hydrology & meteorology
3
610 - Medicine & health
3
700 - The arts; fine & decorative arts
3
140 - Specific philosophical schools
2
150 - Psychology
2
155 - Differential & developmental psychology
2
170 - Ethics
2
320 - Political science
2
333 - Economics of land & energy
2
381 - Commerce
2
600 - Technology
2
620 - Engineering & allied operations
2
630 - Agriculture & related technologies
2
659 - Advertising & public relations
2
808 - Rhetoric & collections of literature
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
350 - Public administration & military science
1
580 - Plants (Botany)
1
615 - Pharmacology & therapeutics
1