Classification
363 - Other social problems & services
333 - Economics of land & energy
4
330 - Economics
3
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
2
320 - Political science
2
380 - Commerce, communications & transportation
2
580 - Plants (Botany)
2
600 - Technology
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
720 - Architecture
2
900 - History & geography
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
658 - General management
1