Classification
900 - History & geography
10
320 - Political science
6
304 - Factors affecting social behavior
3
576 - Genetics & evolution
3
700 - The arts; fine & decorative arts
3
140 - Specific philosophical schools
2
200 - Religion
2
100 - Philosophy & psychology
1
170 - Ethics
1
300 - Social sciences
1
333 - Economics of land & energy
1
340 - Law
1
370 - Education
1
581 - Specific topics in natural history
1
791 - Public performances
1
800 - Literature & rhetoric
1