Classification
000 - Computer science, information & general works
333 - Economics of land & energy
2
600 - Technology
2
620 - Engineering & allied operations
2
720 - Architecture
900 - History & geography
2
170 - Ethics
1
330 - Economics
1
363 - Other social problems & services
1
551 - Geology, hydrology & meteorology
1
610 - Medicine & health
1