Classification
330 - Economics
4
363 - Other social problems & services
540 - Chemistry & allied sciences
600 - Technology
620 - Engineering & allied operations
4
320 - Political science
2
333 - Economics of land & energy
2
580 - Plants (Botany)
2
380 - Commerce, communications & transportation
1
581 - Specific topics in natural history
1
658 - General management
1
700 - The arts; fine & decorative arts
1
800 - Literature & rhetoric
1
900 - History & geography
1