Classification
000 - Computer science, information & general works
320 - Political science
363 - Other social problems & services
380 - Commerce, communications & transportation
700 - The arts; fine & decorative arts
7
333 - Economics of land & energy
6
330 - Economics
5
551 - Geology, hydrology & meteorology
4
600 - Technology
4
140 - Specific philosophical schools
3
900 - History & geography
3
610 - Medicine & health
2
720 - Architecture
2
300 - Social sciences
1
340 - Law
1
370 - Education
1
530 - Physics
1
550 - Earth sciences
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1