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