Classification
340 - Law
500 - Natural sciences & mathematics
700 - The arts; fine & decorative arts
12
000 - Computer science, information & general works
7
333 - Economics of land & energy
7
600 - Technology
7
620 - Engineering & allied operations
7
900 - History & geography
6
380 - Commerce, communications & transportation
5
363 - Other social problems & services
4
576 - Genetics & evolution
4
140 - Specific philosophical schools
3
320 - Political science
3
330 - Economics
3
720 - Architecture
3
414 - Phonology & phonetics
2
530 - Physics
1