Classification
140 - Specific philosophical schools
320 - Political science
380 - Commerce, communications & transportation
600 - Technology
700 - The arts; fine & decorative arts
12
363 - Other social problems & services
11
000 - Computer science, information & general works
7
620 - Engineering & allied operations
7
900 - History & geography
7
330 - Economics
6
333 - Economics of land & energy
6
576 - Genetics & evolution
5
340 - Law
4
500 - Natural sciences & mathematics
4
581 - Specific topics in natural history
4
720 - Architecture
4
200 - Religion
3
361 - Social problems & social welfare in general
3
304 - Factors affecting social behavior
2
370 - Education
2
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
630 - Agriculture & related technologies
2
301 - Sociology & anthropology
1
336 - Public finance
1
580 - Plants (Botany)
1
657 - Accounting
1
658 - General management
1
800 - Literature & rhetoric
1