Classification
551 - Geology, hydrology & meteorology
700 - The arts; fine & decorative arts
4
000 - Computer science, information & general works
2
333 - Economics of land & energy
2
600 - Technology
2
620 - Engineering & allied operations
2
363 - Other social problems & services
1
550 - Earth sciences
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
630 - Agriculture & related technologies
1
900 - History & geography
1