Classification
300 - Social sciences
330 - Economics
63
658 - General management
46
302 - Social interaction
35
370 - Education
34
500 - Natural sciences & mathematics
34
381 - Commerce
30
670 - Manufacturing
29
320 - Political science
27
333 - Economics of land & energy
19
100 - Philosophy & psychology
17
600 - Technology
14
700 - The arts; fine & decorative arts
14
380 - Commerce, communications & transportation
11
338 - Production
10
900 - History & geography
10
363 - Other social problems & services
9
650 - Management & auxiliary services
9
000 - Computer science, information & general works
7
153 - Mental processes & intelligence
7
170 - Ethics
7
340 - Law
7
610 - Medicine & health
7
620 - Engineering & allied operations
7
158 - Applied psychology
6
301 - Sociology & anthropology
6
551 - Geology, hydrology & meteorology
6
659 - Advertising & public relations
6
140 - Specific philosophical schools
5
331 - Labor economics
5
400 - Language
5
304 - Factors affecting social behavior
4
576 - Genetics & evolution
4
630 - Agriculture & related technologies
4
745 - Decorative arts
4
200 - Religion
3
384 - Communications; telecommunication
3
580 - Plants (Botany)
3
581 - Specific topics in natural history
3
720 - Architecture
3
800 - Literature & rhetoric
2
001 - Knowledge
1
005 - Computer programming, programs & data
1
006 - Special computer methods
1
120 - Epistemology, causation & humankind
1
150 - Psychology
1
332 - Financial economics
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
more ...