Classification
600 - Technology
900 - History & geography
4
140 - Specific philosophical schools
3
620 - Engineering & allied operations
3
700 - The arts; fine & decorative arts
3
800 - Literature & rhetoric
3
301 - Sociology & anthropology
1
320 - Political science
1
330 - Economics
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
370 - Education
1
530 - Physics
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1