Classification
170 - Ethics
330 - Economics
46
320 - Political science
41
610 - Medicine & health
41
140 - Specific philosophical schools
30
100 - Philosophy & psychology
26
340 - Law
25
600 - Technology
17
300 - Social sciences
16
363 - Other social problems & services
12
620 - Engineering & allied operations
10
900 - History & geography
10
700 - The arts; fine & decorative arts
9
000 - Computer science, information & general works
8
174 - Occupational ethics
8
370 - Education
8
580 - Plants (Botany)
8
200 - Religion
7
333 - Economics of land & energy
7
658 - General management
6
361 - Social problems & social welfare in general
5
800 - Literature & rhetoric
5
301 - Sociology & anthropology
4
331 - Labor economics
4
338 - Production
4
630 - Agriculture & related technologies
4
400 - Language
3
551 - Geology, hydrology & meteorology
3
576 - Genetics & evolution
3
581 - Specific topics in natural history
3
001 - Knowledge
2
120 - Epistemology, causation & humankind
2
297 - Islam, Babism & Bahai Faith
2
304 - Factors affecting social behavior
2
410 - Linguistics
2
616 - Diseases
2
006 - Special computer methods
1
158 - Applied psychology
1
160 - Logic
1
179 - Other ethical norms
1
302 - Social interaction
1
344 - Labor, social, education & cultural law
1
346 - Private law
1
362 - Social welfare problems & services
1
380 - Commerce, communications & transportation
1
381 - Commerce
1
520 - Astronomy & allied sciences
1
530 - Physics
1
612 - Human physiology
1
660 - Chemical engineering
1
more ...