Classification
600 - Technology
620 - Engineering & allied operations
37
900 - History & geography
28
700 - The arts; fine & decorative arts
27
333 - Economics of land & energy
21
000 - Computer science, information & general works
8
363 - Other social problems & services
8
414 - Phonology & phonetics
8
576 - Genetics & evolution
7
540 - Chemistry & allied sciences
6
380 - Commerce, communications & transportation
5
580 - Plants (Botany)
5
330 - Economics
3
140 - Specific philosophical schools
2
530 - Physics
2
610 - Medicine & health
2
650 - Management & auxiliary services
2
340 - Law
1
500 - Natural sciences & mathematics
1
780 - Music
1
800 - Literature & rhetoric
1