Classification
320 - Political science
8
140 - Specific philosophical schools
3
900 - History & geography
3
300 - Social sciences
2
350 - Public administration & military science
2
361 - Social problems & social welfare in general
2
304 - Factors affecting social behavior
1
330 - Economics
1
337 - International economics
1
339 - Macroeconomics & related topics
1
340 - Law
1
363 - Other social problems & services
1
370 - Education
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1