Classification
340 - Law
140 - Specific philosophical schools
2
300 - Social sciences
2
320 - Political science
2
370 - Education
2
100 - Philosophy & psychology
1
304 - Factors affecting social behavior
1
330 - Economics
1
333 - Economics of land & energy
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
551 - Geology, hydrology & meteorology
1