Classification
330 - Economics
333 - Economics of land & energy
380 - Commerce, communications & transportation
551 - Geology, hydrology & meteorology
600 - Technology
363 - Other social problems & services
12
700 - The arts; fine & decorative arts
10
900 - History & geography
10
620 - Engineering & allied operations
8
000 - Computer science, information & general works
7
320 - Political science
7
370 - Education
5
580 - Plants (Botany)
5
610 - Medicine & health
5
720 - Architecture
4
140 - Specific philosophical schools
3
630 - Agriculture & related technologies
3
658 - General management
3
340 - Law
2
530 - Physics
2
576 - Genetics & evolution
2
581 - Specific topics in natural history
2
336 - Public finance
1
361 - Social problems & social welfare in general
1
800 - Literature & rhetoric
1