Classification
330 - Economics
658 - General management
300 - Social sciences
140
302 - Social interaction
61
380 - Commerce, communications & transportation
48
384 - Communications; telecommunication
46
500 - Natural sciences & mathematics
37
670 - Manufacturing
28
338 - Production
27
331 - Labor economics
25
381 - Commerce
15
363 - Other social problems & services
13
650 - Management & auxiliary services
13
333 - Economics of land & energy
12
600 - Technology
11
620 - Engineering & allied operations
11
000 - Computer science, information & general works
9
610 - Medicine & health
9
700 - The arts; fine & decorative arts
9
158 - Applied psychology
8
332 - Financial economics
8
630 - Agriculture & related technologies
7
580 - Plants (Botany)
6
140 - Specific philosophical schools
5
153 - Mental processes & intelligence
5
362 - Social welfare problems & services
5
001 - Knowledge
4
150 - Psychology
4
170 - Ethics
4
370 - Education
4
100 - Philosophy & psychology
3
303 - Social processes
3
320 - Political science
3
551 - Geology, hydrology & meteorology
3
900 - History & geography
3
155 - Differential & developmental psychology
2
659 - Advertising & public relations
2
800 - Literature & rhetoric
2
808 - Rhetoric & collections of literature
2
004 - Data processing & computer science
1
006 - Special computer methods
1
160 - Logic
1
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
307 - Communities
1
336 - Public finance
1
340 - Law
1
350 - Public administration & military science
1
510 - Mathematics
1
519 - Probabilities & applied mathematics
1
more ...