Classification
320 - Political science
340 - Law
363 - Other social problems & services
600 - Technology
700 - The arts; fine & decorative arts
7
380 - Commerce, communications & transportation
6
610 - Medicine & health
5
000 - Computer science, information & general works
4
140 - Specific philosophical schools
4
333 - Economics of land & energy
4
576 - Genetics & evolution
4
620 - Engineering & allied operations
4
900 - History & geography
4
330 - Economics
3
500 - Natural sciences & mathematics
3
581 - Specific topics in natural history
3
720 - Architecture
3
551 - Geology, hydrology & meteorology
2
200 - Religion
1
300 - Social sciences
1
301 - Sociology & anthropology
1
657 - Accounting
1