Classification
320 - Political science
330 - Economics
363 - Other social problems & services
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
333 - Economics of land & energy
8
620 - Engineering & allied operations
8
000 - Computer science, information & general works
4
370 - Education
4
380 - Commerce, communications & transportation
4
551 - Geology, hydrology & meteorology
4
580 - Plants (Botany)
3
610 - Medicine & health
3
720 - Architecture
3
658 - General management
2
140 - Specific philosophical schools
1
360 - Social problems & services; associations
1
581 - Specific topics in natural history
1