Classification
380 - Commerce, communications & transportation
600 - Technology
630 - Agriculture & related technologies
000 - Computer science, information & general works
10
620 - Engineering & allied operations
10
333 - Economics of land & energy
7
700 - The arts; fine & decorative arts
7
330 - Economics
6
363 - Other social problems & services
6
580 - Plants (Botany)
6
551 - Geology, hydrology & meteorology
5
610 - Medicine & health
5
140 - Specific philosophical schools
4
370 - Education
2
576 - Genetics & evolution
2
581 - Specific topics in natural history
2
658 - General management
2
320 - Political science
1
361 - Social problems & social welfare in general
1
400 - Language
1
540 - Chemistry & allied sciences
1
612 - Human physiology
1
720 - Architecture
1
900 - History & geography
1