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