Classification
000 - Computer science, information & general works
2
333 - Economics of land & energy
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
600 - Technology
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
800 - Literature & rhetoric
2
900 - History & geography
2
330 - Economics
1