Classification
000 - Computer science, information & general works
400 - Language
500 - Natural sciences & mathematics
530 - Physics
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
333 - Economics of land & energy
1
363 - Other social problems & services
1
550 - Earth sciences
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1