Classification
170 - Ethics
320 - Political science
610 - Medicine & health
100 - Philosophy & psychology
13
600 - Technology
8
330 - Economics
5
900 - History & geography
5
300 - Social sciences
4
333 - Economics of land & energy
4
363 - Other social problems & services
4
700 - The arts; fine & decorative arts
4
140 - Specific philosophical schools
3
340 - Law
3
370 - Education
3
620 - Engineering & allied operations
3
000 - Computer science, information & general works
2
380 - Commerce, communications & transportation
2
530 - Physics
2
630 - Agriculture & related technologies
2
120 - Epistemology, causation & humankind
1
200 - Religion
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
800 - Literature & rhetoric
1