Classification
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
333 - Economics of land & energy
1
410 - Linguistics
1
580 - Plants (Botany)
1
600 - Technology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
900 - History & geography
1