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