Classification
540 - Chemistry & allied sciences
900 - History & geography
8
500 - Natural sciences & mathematics
5
530 - Physics
5
700 - The arts; fine & decorative arts
4
333 - Economics of land & energy
3
600 - Technology
3
620 - Engineering & allied operations
3
520 - Astronomy & allied sciences
2
140 - Specific philosophical schools
1
300 - Social sciences
1
301 - Sociology & anthropology
1
363 - Other social problems & services
1
580 - Plants (Botany)
1
610 - Medicine & health
1
612 - Human physiology
1
800 - Literature & rhetoric
1