Classification
100 - Philosophy & psychology
330 - Economics
610 - Medicine & health
361 - Social problems & social welfare in general
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
600 - Technology
1
620 - Engineering & allied operations
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1