Classification
340 - Law
2
500 - Natural sciences & mathematics
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
300 - Social sciences
1
320 - Political science
1
330 - Economics
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
540 - Chemistry & allied sciences
1
900 - History & geography
1