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