Classification
330 - Economics
500 - Natural sciences & mathematics
658 - General management
300 - Social sciences
1,427
302 - Social interaction
1,406
670 - Manufacturing
1,392
338 - Production
346
381 - Commerce
257
331 - Labor economics
221
384 - Communications; telecommunication
129
650 - Management & auxiliary services
123
620 - Engineering & allied operations
102
158 - Applied psychology
101
153 - Mental processes & intelligence
98
332 - Financial economics
68
380 - Commerce, communications & transportation
65
745 - Decorative arts
44
005 - Computer programming, programs & data
41
004 - Data processing & computer science
38
001 - Knowledge
32
368 - Insurance
32
006 - Special computer methods
31
303 - Social processes
30
510 - Mathematics
24
519 - Probabilities & applied mathematics
16
659 - Advertising & public relations
15
363 - Other social problems & services
12
000 - Computer science, information & general works
11
808 - Rhetoric & collections of literature
10
374 - Adult education
8
150 - Psychology
7
155 - Differential & developmental psychology
7
170 - Ethics
7
382 - International commerce
7
152 - Perception, movement, emotions & drives
6
304 - Factors affecting social behavior
6
364 - Criminology
6
600 - Technology
6
305 - Social groups
4
339 - Macroeconomics & related topics
4
025 - Library operations
3
352 - General considerations of public administration
3
610 - Medicine & health
3
800 - Literature & rhetoric
3
324 - The political process
2
343 - Military, tax, trade & industrial law
2
361 - Social problems & social welfare in general
2
604 - Special topics
2
629 - Other branches of engineering
2
003 - Systems
1
more ...