Classification
140 - Specific philosophical schools
551 - Geology, hydrology & meteorology
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
301 - Sociology & anthropology
1
330 - Economics
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
600 - Technology
1
620 - Engineering & allied operations
1
900 - History & geography
1