Classification
100 - Philosophy & psychology
320 - Political science
330 - Economics
610 - Medicine & health
600 - Technology
4
170 - Ethics
3
300 - Social sciences
3
333 - Economics of land & energy
3
363 - Other social problems & services
2
581 - Specific topics in natural history
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
900 - History & geography
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
350 - Public administration & military science
1
370 - Education
1
530 - Physics
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
630 - Agriculture & related technologies
1
780 - Music
1
800 - Literature & rhetoric
1