Classification
140 - Specific philosophical schools
333 - Economics of land & energy
1
363 - Other social problems & services
1
530 - Physics
1
580 - Plants (Botany)
1
600 - Technology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1