Classification
170 - Ethics
320 - Political science
330 - Economics
333 - Economics of land & energy
100 - Philosophy & psychology
6
140 - Specific philosophical schools
6
300 - Social sciences
4
363 - Other social problems & services
4
000 - Computer science, information & general works
3
200 - Religion
3
581 - Specific topics in natural history
3
700 - The arts; fine & decorative arts
3
600 - Technology
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
900 - History & geography
2
340 - Law
1
361 - Social problems & social welfare in general
1
370 - Education
1
530 - Physics
1
800 - Literature & rhetoric
1