Classification
170 - Ethics
320 - Political science
330 - Economics
19
100 - Philosophy & psychology
11
140 - Specific philosophical schools
9
340 - Law
8
300 - Social sciences
7
600 - Technology
5
363 - Other social problems & services
4
630 - Agriculture & related technologies
4
700 - The arts; fine & decorative arts
4
200 - Religion
3
333 - Economics of land & energy
3
620 - Engineering & allied operations
3
800 - Literature & rhetoric
3
900 - History & geography
3
301 - Sociology & anthropology
2
400 - Language
2
410 - Linguistics
2
610 - Medicine & health
2
000 - Computer science, information & general works
1
120 - Epistemology, causation & humankind
1
160 - Logic
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
380 - Commerce, communications & transportation
1
520 - Astronomy & allied sciences
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1