Classification
500 - Natural sciences & mathematics
600 - Technology
6
700 - The arts; fine & decorative arts
6
333 - Economics of land & energy
5
620 - Engineering & allied operations
4
000 - Computer science, information & general works
3
363 - Other social problems & services
3
330 - Economics
2
540 - Chemistry & allied sciences
2
576 - Genetics & evolution
2
900 - History & geography
2
338 - Production
1
340 - Law
1
530 - Physics
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
658 - General management
1
800 - Literature & rhetoric
1