Classification
100 - Philosophy & psychology
330 - Economics
3
610 - Medicine & health
3
900 - History & geography
300 - Social sciences
2
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
333 - Economics of land & energy
1
370 - Education
1
600 - Technology
1
700 - The arts; fine & decorative arts
1
800 - Literature & rhetoric
1