Classification
330 - Economics
16
340 - Law
320 - Political science
9
333 - Economics of land & energy
7
700 - The arts; fine & decorative arts
5
900 - History & geography
5
100 - Philosophy & psychology
4
300 - Social sciences
4
140 - Specific philosophical schools
3
363 - Other social problems & services
3
581 - Specific topics in natural history
3
170 - Ethics
2
380 - Commerce, communications & transportation
2
576 - Genetics & evolution
2
630 - Agriculture & related technologies
2
200 - Religion
1
301 - Sociology & anthropology
1
361 - Social problems & social welfare in general
1
370 - Education
1
410 - Linguistics
1
551 - Geology, hydrology & meteorology
1
791 - Public performances
1
800 - Literature & rhetoric
1