Classification
500 - Natural sciences & mathematics
551 - Geology, hydrology & meteorology
363 - Other social problems & services
9
700 - The arts; fine & decorative arts
7
000 - Computer science, information & general works
5
600 - Technology
5
620 - Engineering & allied operations
5
333 - Economics of land & energy
4
630 - Agriculture & related technologies
4
610 - Medicine & health
3
300 - Social sciences
2
320 - Political science
2
370 - Education
2
530 - Physics
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
800 - Literature & rhetoric
2
900 - History & geography
2
140 - Specific philosophical schools
1
330 - Economics
1
380 - Commerce, communications & transportation
1
400 - Language
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1