Classification
320 - Political science
330 - Economics
900 - History & geography
17
300 - Social sciences
12
340 - Law
12
630 - Agriculture & related technologies
6
200 - Religion
5
333 - Economics of land & energy
5
363 - Other social problems & services
5
700 - The arts; fine & decorative arts
5
576 - Genetics & evolution
4
780 - Music
4
000 - Computer science, information & general works
2
100 - Philosophy & psychology
2
304 - Factors affecting social behavior
2
400 - Language
2
581 - Specific topics in natural history
2
600 - Technology
2
610 - Medicine & health
2
140 - Specific philosophical schools
1
301 - Sociology & anthropology
1
336 - Public finance
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
800 - Literature & rhetoric
1