Classification
363 - Other social problems & services
5
500 - Natural sciences & mathematics
551 - Geology, hydrology & meteorology
630 - Agriculture & related technologies
700 - The arts; fine & decorative arts
4
000 - Computer science, information & general works
3
333 - Economics of land & energy
2
580 - Plants (Botany)
2
600 - Technology
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
800 - Literature & rhetoric
2
300 - Social sciences
1
320 - Political science
1
330 - Economics
1
370 - Education
1
380 - Commerce, communications & transportation
1
530 - Physics
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
900 - History & geography
1