Classification
330 - Economics
2
600 - Technology
2
658 - General management
900 - History & geography
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
297 - Islam, Babism & Bahai Faith
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1