Classification
300 - Social sciences
330 - Economics
333 - Economics of land & energy
4
363 - Other social problems & services
600 - Technology
620 - Engineering & allied operations
4
630 - Agriculture & related technologies
700 - The arts; fine & decorative arts
4
140 - Specific philosophical schools
2
301 - Sociology & anthropology
2
320 - Political science
2
610 - Medicine & health
2
100 - Philosophy & psychology
1
304 - Factors affecting social behavior
1
350 - Public administration & military science
1
540 - Chemistry & allied sciences
1
551 - Geology, hydrology & meteorology
1
900 - History & geography
1