Classification
658 - General management
56
610 - Medicine & health
48
330 - Economics
34
700 - The arts; fine & decorative arts
34
333 - Economics of land & energy
30
363 - Other social problems & services
29
140 - Specific philosophical schools
28
370 - Education
22
100 - Philosophy & psychology
21
000 - Computer science, information & general works
17
320 - Political science
14
600 - Technology
13
616 - Diseases
12
612 - Human physiology
11
158 - Applied psychology
10
620 - Engineering & allied operations
9
361 - Social problems & social welfare in general
7
362 - Social welfare problems & services
7
380 - Commerce, communications & transportation
7
900 - History & geography
7
304 - Factors affecting social behavior
6
551 - Geology, hydrology & meteorology
6
650 - Management & auxiliary services
6
170 - Ethics
5
300 - Social sciences
5
500 - Natural sciences & mathematics
5
303 - Social processes
4
306 - Culture & institutions
4
720 - Architecture
4
150 - Psychology
3
200 - Religion
3
340 - Law
3
580 - Plants (Botany)
3
630 - Agriculture & related technologies
3
338 - Production
2
360 - Social problems & services; associations
2
378 - Higher education
2
576 - Genetics & evolution
2
614 - Incidence & prevention of disease
2
615 - Pharmacology & therapeutics
2
621 - Applied physics
2
780 - Music
2
120 - Epistemology, causation & humankind
1
153 - Mental processes & intelligence
1
174 - Occupational ethics
1
204 - Religious experience, life & practice
1
301 - Sociology & anthropology
1
305 - Social groups
1
331 - Labor economics
1
332 - Financial economics
1
more ...