Classification
610 - Medicine & health
900 - History & geography
300 - Social sciences
8
333 - Economics of land & energy
3
370 - Education
3
600 - Technology
3
620 - Engineering & allied operations
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
304 - Factors affecting social behavior
2
363 - Other social problems & services
2
301 - Sociology & anthropology
1
330 - Economics
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1