Classification
170 - Ethics
361 - Social problems & social welfare in general
363 - Other social problems & services
610 - Medicine & health
2
100 - Philosophy & psychology
1
320 - Political science
1
360 - Social problems & services; associations
1
370 - Education
1
600 - Technology
1
620 - Engineering & allied operations
1
660 - Chemical engineering
1
900 - History & geography
1