Classification
100 - Philosophy & psychology
170 - Ethics
320 - Political science
330 - Economics
700 - The arts; fine & decorative arts
140 - Specific philosophical schools
2
300 - Social sciences
2
333 - Economics of land & energy
2
363 - Other social problems & services
2
340 - Law
1
361 - Social problems & social welfare in general
1
581 - Specific topics in natural history
1