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