Classification
600 - Technology
39
620 - Engineering & allied operations
39
900 - History & geography
700 - The arts; fine & decorative arts
21
333 - Economics of land & energy
11
000 - Computer science, information & general works
9
380 - Commerce, communications & transportation
7
330 - Economics
5
414 - Phonology & phonetics
5
363 - Other social problems & services
4
576 - Genetics & evolution
4
140 - Specific philosophical schools
3
340 - Law
3
500 - Natural sciences & mathematics
3
530 - Physics
3
551 - Geology, hydrology & meteorology
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
800 - Literature & rhetoric
2
400 - Language
1
540 - Chemistry & allied sciences
1
610 - Medicine & health
1
657 - Accounting
1