Classification
320 - Political science
333 - Economics of land & energy
380 - Commerce, communications & transportation
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
620 - Engineering & allied operations
8
000 - Computer science, information & general works
6
330 - Economics
6
720 - Architecture
6
363 - Other social problems & services
5
610 - Medicine & health
5
551 - Geology, hydrology & meteorology
4
370 - Education
3
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
400 - Language
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
658 - General management
1
800 - Literature & rhetoric
1