Classification
140 - Specific philosophical schools
1
297 - Islam, Babism & Bahai Faith
1
330 - Economics
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
600 - Technology
610 - Medicine & health
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
658 - General management
1
900 - History & geography
1