Classification
301 - Sociology & anthropology
330 - Economics
900 - History & geography
300 - Social sciences
18
320 - Political science
12
100 - Philosophy & psychology
9
140 - Specific philosophical schools
5
304 - Factors affecting social behavior
5
333 - Economics of land & energy
5
363 - Other social problems & services
4
600 - Technology
4
700 - The arts; fine & decorative arts
4
340 - Law
3
370 - Education
3
576 - Genetics & evolution
3
610 - Medicine & health
3
000 - Computer science, information & general works
2
170 - Ethics
2
200 - Religion
2
380 - Commerce, communications & transportation
2
530 - Physics
2
620 - Engineering & allied operations
2
400 - Language
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1