Classification
100 - Philosophy & psychology
363 - Other social problems & services
581 - Specific topics in natural history
900 - History & geography
333 - Economics of land & energy
4
140 - Specific philosophical schools
3
301 - Sociology & anthropology
3
320 - Political science
3
330 - Economics
3
000 - Computer science, information & general works
2
300 - Social sciences
2
576 - Genetics & evolution
2
610 - Medicine & health
2
700 - The arts; fine & decorative arts
2
170 - Ethics
1
200 - Religion
1
340 - Law
1
350 - Public administration & military science
1
380 - Commerce, communications & transportation
1
400 - Language
1
530 - Physics
1
590 - Animals (Zoology)
1
600 - Technology
1
780 - Music
1
791 - Public performances
1
800 - Literature & rhetoric
1