Classification
600 - Technology
900 - History & geography
14
000 - Computer science, information & general works
13
620 - Engineering & allied operations
13
700 - The arts; fine & decorative arts
11
330 - Economics
4
333 - Economics of land & energy
4
363 - Other social problems & services
4
380 - Commerce, communications & transportation
4
500 - Natural sciences & mathematics
4
140 - Specific philosophical schools
3
800 - Literature & rhetoric
3
340 - Law
2
576 - Genetics & evolution
2
610 - Medicine & health
2
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
612 - Human physiology
1
658 - General management
1
720 - Architecture
1
780 - Music
1