Classification
170 - Ethics
330 - Economics
340 - Law
320 - Political science
18
100 - Philosophy & psychology
7
300 - Social sciences
6
700 - The arts; fine & decorative arts
6
140 - Specific philosophical schools
4
900 - History & geography
4
610 - Medicine & health
3
000 - Computer science, information & general works
2
301 - Sociology & anthropology
2
333 - Economics of land & energy
2
370 - Education
2
380 - Commerce, communications & transportation
2
600 - Technology
2
304 - Factors affecting social behavior
1
363 - Other social problems & services
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
658 - General management
1