Classification
320 - Political science
576 - Genetics & evolution
700 - The arts; fine & decorative arts
900 - History & geography
330 - Economics
11
600 - Technology
6
363 - Other social problems & services
5
140 - Specific philosophical schools
4
340 - Law
4
380 - Commerce, communications & transportation
4
620 - Engineering & allied operations
4
500 - Natural sciences & mathematics
3
720 - Architecture
3
000 - Computer science, information & general works
2
200 - Religion
2
304 - Factors affecting social behavior
2
551 - Geology, hydrology & meteorology
2
800 - Literature & rhetoric
2
300 - Social sciences
1
398 - Folklore
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
791 - Public performances
1