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