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