Classification
600 - Technology
3
620 - Engineering & allied operations
3
700 - The arts; fine & decorative arts
3
800 - Literature & rhetoric
900 - History & geography
333 - Economics of land & energy
2
576 - Genetics & evolution
2
330 - Economics
1
363 - Other social problems & services
1
580 - Plants (Botany)
1
658 - General management
1