Classification
340 - Law
600 - Technology
18
620 - Engineering & allied operations
900 - History & geography
17
700 - The arts; fine & decorative arts
14
500 - Natural sciences & mathematics
7
576 - Genetics & evolution
7
333 - Economics of land & energy
6
380 - Commerce, communications & transportation
5
720 - Architecture
5
363 - Other social problems & services
4
414 - Phonology & phonetics
4
140 - Specific philosophical schools
3
320 - Political science
3
330 - Economics
2
530 - Physics
2
000 - Computer science, information & general works
1
580 - Plants (Botany)
1
800 - Literature & rhetoric
1