Classification
140 - Specific philosophical schools
363 - Other social problems & services
2
551 - Geology, hydrology & meteorology
2
600 - Technology
2
620 - Engineering & allied operations
100 - Philosophy & psychology
1
320 - Political science
1
330 - Economics
1
333 - Economics of land & energy
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1