Classification
170 - Ethics
300 - Social sciences
900 - History & geography
140 - Specific philosophical schools
4
600 - Technology
4
100 - Philosophy & psychology
3
320 - Political science
3
340 - Law
3
576 - Genetics & evolution
3
200 - Religion
2
301 - Sociology & anthropology
2
330 - Economics
2
333 - Economics of land & energy
2
363 - Other social problems & services
2
380 - Commerce, communications & transportation
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
630 - Agriculture & related technologies
2
700 - The arts; fine & decorative arts
2
720 - Architecture
2
800 - Literature & rhetoric
2
304 - Factors affecting social behavior
1
370 - Education
1
551 - Geology, hydrology & meteorology
1