Classification
551 - Geology, hydrology & meteorology
900 - History & geography
000 - Computer science, information & general works
4
333 - Economics of land & energy
3
620 - Engineering & allied operations
3
700 - The arts; fine & decorative arts
3
530 - Physics
2
581 - Specific topics in natural history
2
600 - Technology
2
800 - Literature & rhetoric
2
140 - Specific philosophical schools
1
363 - Other social problems & services
1
580 - Plants (Botany)
1