Classification
333 - Economics of land & energy
363 - Other social problems & services
3
600 - Technology
3
620 - Engineering & allied operations
658 - General management
330 - Economics
2
380 - Commerce, communications & transportation
2
580 - Plants (Botany)
2
900 - History & geography
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
297 - Islam, Babism & Bahai Faith
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1